Author Archives: GCSDev

Heath or Heather

Often mistaken for one another, heath (Erica) and heather (Calluna) look amazingly similar. To confuse things further, heath is frequently referred to as “spring heather” and some landscapers, garden centers and nurseries may use the names interchangeably. Both types of plants belong to the Ericaceae family, and they share many similarities.

Which is Which?

The key difference between these two popular landscaping plants is that heath blooms from winter to early spring while heather blooms from mid-summer to early fall. Heath features slim, needle-like foliage, while heather’s foliage is flatter and more scale-like. Heath generally only grows to 12 inches tall, while different heather cultivars can range from 8-20 inches tall. With their many similarities for location, soil type and sunlight, however, it is easy to grow these two shrubs together for a much longer and more brilliant flowering season.

Heath and Heather in the Landscape

Both heath and heather are low maintenance, low growing, perennial shrubs that love well-drained, acidic soil, but do not plant them too deeply or their shallow root systems may rot or smother. Heath, or spring heather, has tiny, urn shaped flowers in white, rose or fuchsia and is readily available in early spring. Heather will be more popular later in the season and into early summer, and its bell-like mauve, rose or lavender flowers provide lovely color to the landscape later in the season. Depending on the cultivar, heather’s foliage can range from bright green to golden yellow, reddish or even silvery-gray.

Both plants should be watered well, and mulching around the shrubs will help inhibit weeds and conserve moisture without overwatering. Pruning should be done just after blooming is finished to maintain and shape the plant mounds and discourage overgrowth and legginess.

Heath and heather look terrific planted en masse on a sunny hillside or in the shrub border with other acid-loving plants like azaleas and rhododendrons. They are a welcome addition to the rock garden and can brighten up a dwarf conifer grouping or container garden. Their mounding habit makes the plants easily spill over edges for a naturalized, graceful organic look ideal for cottage gardens and flowing landscape design.

It is important to note, however, that deer can be very attracted to both heath and heather. If these backyard visitors are a problem in your garden or pester your landscape, you may want to take a variety of steps to keep them away from your beautiful shrubs.

Planted together, heath and heather will provide you with a succession of dainty blooms to take you through the entire growing season.

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Growing Under Black Walnut

If you have a black walnut tree on your property, you know how difficult it can be to find anything that will grow anywhere near this plant.

Black walnuts release a substance called juglone into the soil, which is toxic to many ornamental and edible plants and can stunt their growth significantly – in fact, juglone is used as a herbicide in some areas! A mature black walnut tree can have a toxic zone with up to an 80-foot radius, depending on the tree’s size and age. Every part of the walnut tree contains juglone and this substance remains in the soil long after the tree is cut down, continuing to inhibit anything that may be planted in its place.

Fortunately, there is a wide variety of plants that are less affected by juglone and can still thrive in contaminated soil. When choosing to plant in an area where a black walnut is located or where one once stood, it is safe to make your selection from the lists below.

Vegetables

  • Beans
  • Corn
  • Carrots
  • Melons
  • Squash

Fruit

  • Black Raspberry
  • Cherry
  • Nectarine
  • Peach
  • Pear
  • Plum

Annuals

  • Pot-marigold, Calendula officinalis
  • Begonia, fibrous cultivars
  • Morning Glory, Ipomoea
  • Pansy, Viola
  • Zinnia species

Perennials

  • Bugleweed, Ajuga reptans
  • Hollyhock, Alcea rosea
  • European Wild Ginger, Asarum europaeum
  • Astilbe species
  • Bellflower, Campanula latifolia
  • Leopard’s-Bane, Doronicum species
  • Sweet Woodruff, Galium odoratum
  • Cranesbill, Geranium sanguineum
  • Common Daylily, Hemerocallis
  • Coral Bells, Heuchera
  • Plantain-lily, Hosta
  • Siberian Iris, Iris sibirica
  • Balm, Monarda didyma
  • Sundrops, Oenothera fruticosa
  • Summer Phlox, Phlox paniculata
  • Polyanthus Primrose, Primula x polyantha
  • Lungwort, Pulmonaria species
  • Showy Sedum, Sedum spectabile
  • Lamb’s-Ear, Stachys byzantina
  • Spiderwort, Tradescantia virginiana
  • Horned Violet, Viola cornuta

Ferns

  • Crested Wood Fern, Dryopteris cristata
  • Senstitive Fern, Onoclea sensibilis
  • Cinnamon Fern, Osmunda cinnamomea

Bulbs

  • Glory-of-the-Snow, Chionodoxa luciliae
  • Crocus species
  • Winter Aconite, Eranthis hyemalis
  • Snowdrop, Galanthus nivalis
  • Spanish Bluebell, Hyacinthoides hispanica
  • Grape Hyacinth, Muscari botryoides
  • Siberian Squill, Scilla sibirica

Trees

  • Japanese Maples, Acer palmatum
  • Eastern Redbud, Cercis canadensis
  • Canadian Hemlock, Tsuga canadensis

Vines and Shrubs

  • Euonymus species
  • Rose of Sharon, Hibiscus syriacus
  • Honeysuckle, Lonicera species
  • Virginia Creeper, Parthenocissus quinquefolia
  • Arborvitaes, Thuja species

Black walnut can be a challenging plant to have in your landscape, but if you understand the unique characteristics of this tree you can easily pair it with other plants that don’t mind its toxic effects.

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Geranium ‘Biokovo’

“So many Geraniums, so little time.” If this is your motto, we completely understand. There are so many fantastic varieties to choose from, but geranium x cantabrigiense ‘Biokovo’ is extraordinary, and is one bloom you should certainly make time for.

Unlike our tender summer annual commonly called geranium (genus: Pelargonium), true geraniums are hardy, low growing, groundcover perennials commonly known as “cranesbill.” They look nothing like the more familiar, misnamed geraniums and they certainly do not behave similarly. The more you learn about these true geraniums, however, the more you will love them.

About ‘Biokovo’

G. ‘Biokovo’, originally found growing in the mountains of Croatia, is cold hardy and semi-evergreen in hardiness zones 5-8. Growing up to a foot tall and 12-18 inches wide, this cranesbill blooms in late spring, generally stretching from May to June with sporadic reblooming. The five-petaled, three-quarter-inch, white flowers show a tinge of pink in the center, surrounding brighter pink pistils topped with golden yellow stamens. The petals have a slightly frilly texture, giving these blooms a romantic delicacy. The leaves are slightly hairy, lobed, medium green, and develop an orange-red tint in the fall to provide beauty and color in different seasons. The foliage is highly aromatic with a pungent, orange-like scent when bruised.

Planting Geranium ‘Biokovo’

Produced on spreading rhizomes that can vigorously cover an area, G. ‘Biokovo’ is easily grown in well-drained soil with average fertility and neutral (7.0) pH. It is relatively drought-tolerant once established and will thrive planted in either full sun or part shade, but the hottest afternoon sun is best avoided. Deep shade will also stunt the plant’s growth and may limit blooming. Moist soil is suitable, but the soil should not be over saturated and only average watering is required. Fertilize in early spring for the best nutrition and most vigorous blooming. Plant divisions may be done in either spring or fall to expand the ‘Biokovo’ in your landscape or share it with other enthusiastic true geranium lovers.

‘Biokovo’ in the Landscape

Use ‘Biokova’ in the front of the perennial border and in rock gardens to add color, texture and softness. It will steal the show as a long-blooming ground cover or edging plant, and can be ideal to add natural, flowing lines to the edge of flowerbeds, driveways or sidewalks. There are no serious pest or disease problems associated with this or any of the many other hardy geraniums. It attracts butterflies and resists deer and rabbits. Why wait to add this beauty to your flowerbeds?

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Putting on Airs: Tillandsias

Looking for something easy to grow? Tillandsias should be on the top of your list. Tillandsia is the largest genus in the Bromeliad family with over 650 species that vary in color, size, texture and shape. In their native habitat, Tillandsias attach themselves to trees and rocks using their roots. They derive the nutrients and water they need from the air, hence the common name “air plant.” And like their name implies, no soil is necessary for a beautiful, thriving specimen! This versatile houseplant is not fussy, and when given minimal care, will adapt to most home and office environments.

About Tillandsias

Tillandsias are evergreen flowering perennials, and their native range spreads from the southeastern United States to Central and South America. While they are often associated with tropical regions, these diverse plants can also be found in deserts, high mountain ranges and rocky habitats.

It is a common misconception that these are rootless plants – in fact, their roots are critical to serve as anchors and keep the plants stable, though the roots do not absorb moisture or nutrition like other plants. Instead, these plants absorb all they need through their foliage.

Caring for Tillandsias

These delicate plants are easy to care for, but there are some tricks necessary to keep them healthy and looking their very best.

  • Light
    Place your Tillandsias where they will receive plenty of light but not direct sunlight. Direct sun will dry out the leaves very quickly and can cause dehydration and wilting. Home or office fluorescent lighting works just fine.
  • Temperature
    Typical indoor temperatures are perfectly suitable for Tillandsias, and a range of 50-90 degrees Fahrenheit is ideal.
  • Water
    Once a month, soak your air plant in water for about 20 minutes. If the plant is flowering, a delicate rinse would be more appropriate so that the bloom is not damaged. When through soaking, shake off the excess water from the plant and place in an area with good air circulation so it can dry easily. In between soaks, spritz your Tillandsias 1-2 times per week with clean water from a spray bottle. Indoor heat and air conditioning rob moisture from the air. If your air plant leaves start to wrinkle or roll, this is a sign of dehydration. Give them a good soak and spritz more frequently.
  • Pruning
    It is not unusual for the outer leaves of an air plant to dry out and turn brown, and these spent leaves can simply be removed. If leaf tips dry a bit and turn brown, cut off the tip and continue with regular care. The plant will grow and look just fine.

One final note, Tillandsias have beautiful brilliant blooms but only bloom once in their lifetime. Depending on the species, the bloom may last several days to several months. Why not try several different Tillandsia varieties so you can experience these amazing blooms?

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Dividing Hybrid Hellebores

Hybrid hellebores bring us all sorts of happiness. These are one of the first plants to bloom in the late winter and early spring and are available in flower colors of chartreuse, cream, white, pink, red and deep purple. Hybrid hellebores are also those rare and treasured perennials that provide year-round interest, giving you the most bang for your buck and brightening your landscape in every season. As evergreens, they never lose their luster, and their flower shapes and textures are quite varied for even more interest, with a cultivar to suit any gardener’s taste. What’s not to be happy about?

A Love Divided

To keep these plants healthy and thriving, and to increase your quantity, division is a necessity. It is important to divide these plants carefully, however, or else you risk sadness with fewer blooms, lopsided plants or even losing these gems. Fortunately, it’s possible for even a novice hellebore lover to divide their plants with confidence.

  1. Divide hybrid hellebores in the spring when it is in bloom. This will also let you see how the blooms are positioned on the plant so you can divide shapes appropriately.
  2. Choose a plant that has at least 5 flower stems. Each one represents a division and will give you great new plants to bloom.
  3. Dig your hellebores up with a garden spade by inserting it deeply into the soil around the perimeter of the plant about 6 inches away from the outer stems of the clump. This will keep the root system largely intact and uninjured.
  4. Lift the clump and shake off loose soil or any trapped rocks or ensnared mulch. You can gently loosen clumps with your fingers, but take care not to damage the roots.
  5. With a garden hose, wash away any additional soil from the clump so the plant roots are exposed. This will help them get established in their new location more quickly.
  6. Divide the clump by cutting through the roots with a heavy-duty serrated knife. Make your root cuts where you see obvious natural divisions between the flower stalks.
  7. Replant your divisions at their original depth, in a shady location. Include plenty of compost in the planting hole for good nourishment. Water well and continue to keep soil from drying out until your new plants are well established.

Before you know it, you’ll have many more hybrid hellebores to enjoy! If you have a few too many, be sure to share the happiness by giving them to family members, friends, neighbors and anyone else who can fall in love with these beauties.

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Peach Leaf Curl

If you grow peaches, you have most likely experienced peach leaf curl. Recognizing the symptoms of this infection and understanding what to do about it can help you keep your peach crop peachy keen.

About Peach Leaf Curl

Peach leaf curl (Taphrina deformas) is a fungal disease that infects the immature leaves of peach and nectarine trees and it is often far worse in years with a cool and rainy spring, conditions that allow this fungus to spread more rapidly. The yearly disease cycle begins at bud swell and continues until the young leaves emerge. The infected leaves turn reddish-brown, pucker, shrivel and fall off the tree. With fewer leaves, the fruit crop is not nourished as well and fruit will be smaller and less productive. On rare occasions, the fruit itself may become infected and will show a scabbed, corky surface in patches.

After the initial infection, the velvety spores are carried by the wind and rain, overwintering in the tree bark to infect the tree again the following spring. Repeated infections will lead to branch die back and eventually shorten the life of the entire tree.

Stopping Peach Leaf Curl

If you are considering growing peaches, choose a leaf curl resistant variety of tree. There are both new resistant varieties as well as resistant heirlooms. If you are already growing peaches, keep your tree healthy with proper and regular pruning that will allow adequate air circulation and sunlight between branches to minimize the damp, cool conditions that help this fungus. Proper feeding and watering of your tree will also help it be more disease-resistant.

If the disease presents itself, apply fungicide every year in the fall after the leaves have dropped. In areas with wet winters, it can be helpful to reapply fungicide in early spring before bud swell. Always rake up and destroy the infected fallen leaves. Safer recommended controls include sulfur and copper-based fungicides. Traditional control products include Daconil and Ferbam, and should be used according to the application instructions. If the infection is localized to just a few branches, it may also be possible to prune away those infected branches in late fall to help minimize the spread of the spores.

Peach leaf curl can be devastating to your peach trees, but if you recognize the disease quickly and take proper steps to minimize its effects, you can keep your trees healthy and protect your crop of sweet, delicious peaches.

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Dealing With Winter Damage

It’s early spring – time to survey the damage that winter has produced. In some areas, shrubs may still be hiding under piles of frozen snow, and could be crushed or compacted. Severed tree limbs may lie scattered across the landscape, and bark may be torn and stripped from trunks. It’s difficult to know what to tackle first, but fortunately, much of the damage is easily correctible.

Repairing Winter-Damaged Trees

When surveying and repairing winter damage, start with your trees – they are generally the most valuable additions to your property. As you survey the damage – broken limbs, torn bark, a tilting trunk – ask yourself “Is this tree salvageable or should it be removed?” If the damage is extensive, or you are unsure about how the damage may affect the tree’s overall health or future growth, hire a professional for a consultation. Replacing a severely damaged tree with a younger one, perhaps a type you like even better, may be the best solution.

If a limb is broken somewhere along its length, or damaged beyond repair, employ good pruning practices and saw off the remaining piece at the branch collar, being careful not to cut into the trunk or leave a stub. Sometimes a fallen limb may strip bark off the tree trunk. To repair this damage, cut the ragged edges of the loose bark away from the stripped area to firmly affixed healthy bark. Nature will take care of the rest. Even if the trunk of the tree is split, the tree may still be saved. For large trees, repairing this type of damage usually requires cabling and bracing done by a professional. If the tree is still young, the crotch may be pulled tightly together and tied or taped until the wound eventually heals.

Repairing Winter-Damaged Shrubs

Shrubs can suffer the same damage as trees, including broken limbs and stripped bark. Heavy snowfall can crush smaller shrubs, and larger varieties may have their trunks or centers split from heavy snow or ice accumulation. Most shrubs are resilient, however, and slowly regain their shape as the weather warms. If branches are bent but not broken, you may tie them together to help them along and prevent further damage from late-season storms. Do not tie tightly and remove twine after about a year. Completely broken branches may be pruned away, but take care to maintain the shrub’s form and balance, keeping in mind its growth pattern so it will not look lopsided or ungainly. Again, if the damage is severe, you may need to replace the plant.

The harder the winter is, the more of a beating trees and shrubs will take. With prompt attention in early spring, however, you can easily undo much of the damage and help your landscape recover with ease.

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Trees For Small Spaces

There’s something about putting a tree in the ground that just feels right. In many cases, you start with just a bare trunk with a few branches and then, rather quickly, it begins sprouting new growth. You nurture your new acquisition and each year it increases in height and girth. Finally, one day, you look out the window and a magnificent mature tree is there to greet you!

Choosing Your Best Tree

Trees are a permanent addition to the landscape and therefore require a great deal of thought and planning in their selection so you are not regretting your choice as the tree matures. When choosing, not only do you need to keep climate and soil type in mind, but you will also need to consider how much space you have, both above and below the ground, and how large your tree will be at maturity. Large trees should be given the room that they need to grow and thrive. Planted in the wrong location, some large trees have far reaching roots that can damage plumbing, break underground utilities and buckle pavement, not to mention branches that can tower dangerously over your roof. Fortunately, there are many small to medium trees available that look great and cause no damage when planted close to your house, sidewalk or driveway.

Top Trees for Small Spaces

  • Acer ginnala (Amur Maple) – Multi-stemmed, rounded habit, bright red fall color, 15-20’ h x 15-20’ w
  • Acer griseum (Paperbark Maple) – Upright, irregular habit, exfoliating bark, excellent red fall color, 20-30’ h x 15-25’ w
  • Acer palmatum (Japanese Maple) – Numerous varieties, textures, colors and forms and sizes for every taste and situation
  • Aesculus pavia (Red Buckeye) – Native to the southeastern United States, red upright flowers in May to early June, flowers attract hummingbirds, 10-20’ h x 10-20’ w
  • Amelanchier canadensis (Shadblow Serviceberry) – North American native, shrubby, multi-stemmed trunk tree, white flowers in early spring, edible purplish-black fruit, reddish-orange fall color, 6-15’ h x 15-20’ w
  • Betula pendula ‘Youngii’ (Young’s Weeping Birch) – Strong weeping tendency, attractive white bark, yellow fall color, 8-12’ h x 10’ w
  • Carpinus caroliniana (American Hornbeam) – Eastern North American native, multi-stemmed, smooth muscular gray bark, yellow/red/orange fall color, 20-30’ h x 20-30’ w
  • Cercis Canadensis (Eastern Redbud) – Eastern North American native, often multi-stemmed, purple-pink flowers in early spring, 20-30’ h x 20-30’ w
  • Chionanthus viriginicus (Fringe Tree) – North American native, multi-stemmed, rounded habit, fringe-like white flowers in May to early June, golden-yellow fall color, 12-20’ h x 12-20’ w
  • Cornus alternifolia (Pagoda Dogwood) – Eastern North American native, tiered horizontal branching, white flowers late May to early June, blue-black fruit, persistent coral colored fruit stalks, yellow/reddish/purple fall color, 25’ h x 25’ w
  • Cornus florida (Flowering Dogwood) – Eastern North American and northern Mexican native, rounded habit, white or pink flowers in mid-May, reddish-purple fall color, 30’ h x 30’ w
  • Cornus kousa (Korean Dogwood) – Rounded habit, vase-shaped branching habit, flowers white aging to pink in early summer, red to purple fall color, 30’ h x 30’ w
  • Cornus mas (Cornelian Cherry Dogwood) – Multi-stemmed, rounded habit, small yellow flowers in early spring, bright red berries in the summer eaten quickly by birds, 20’ h x 20’ w
  • Crataegus viridis ‘Winter King’ (Winter King Hawthorn) – United States native, broad horizontal crown, white flowers in spring, yellow fall color, abundance of small red berries in winter, 15’ h x 20’ w
  • Halesia tetraptera (Carolina Silverbell) – native, irregular to rounded and broad shaped, pendulous white bell-shaped flowers in May, Smooth muscle-like bark, 30 – 40’h x 25 – 35’w
  • Magnolia stellata (Star Magnolia) – Multi-stemmed tree with oval habit, lightly fragrant showy white blooms in early spring, ornamental smooth silver-gray bark, 15-20’ h x 10-15’ w
  • Malus sargentii (Sargent crabapple) – Mounded habit, blooms April through early May, fragrant flowers, pink-red in bud opening to white, very showy deep red fruit held in clusters, 6-8’ h x 9-12’ w
  • Prunus cerasifera ‘Thundercloud’ (Thundercloud Plum) – Rounded habit, deep purple foliage all year around, slightly fragrant pink flowers in the spring, 20’ h x 20’ w
  • Stewartia koreana (Korean Stewartia) – Pyramidal or oval in shape, white flowers in June and July, long bloom time, excellent fall color orange/yellow/red/purple, 25’ h x 12’ w
  • Stewartia ovate (Mountain Stewartia) – Slow grower, dense with spreading branches, white flowers in July, orange to red fall color, 10-15’ h x 10-15’ w
  • Stewartia pseudocamellia (Japanese Stewartia) – Slow grower, pyramidal, solitary white camellia-like flowers June to August, excellent fall color yellow/red/purple, beautiful exfoliating camouflage bark exposed in the winter, 40’ h x 20’ w
  • Styrax japonica (Japanese Snowbell) – Horizontal branching, broad flat top at maturity, hanging white flowers from late May into June, good fall color of yellow with a reddish cast, 20-30’ h x 20-30’ w
  • Syringa reticulate (Japanese Tree Lilac) – Stiff spreading branches, fragrant showy white flowers borne in early summer on panicles up to 12″ long and up to 10” wide, 20’ h x 15’ w

Overwhelmed with small tree varieties and not sure which one is best for your yard? Let our experts help you choose the perfect tree to fit your space!

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Nurturing Spring Bulbs

Spring bulbs faithfully reappear at the most advantageous time – after a long, cold winter, just when we’re longing for bright colors to relieve the monotony of winter snow and ice. Most spring bulbs are perennial and multiply in number every year, bringing more beauty to the flowerbeds each spring, but some problems can destroy a carefully planted bulb bed. Seemingly carefree, bulbs do require a bit of nurturing to ensure they perform their very best for years to come.

Tips for Bulb Care

  1. Good soil drainage is important to prevent bulbs from rotting so plan your site accordingly. Do not plant bulbs near areas where downspouts let out or large snow piles may build up and spring melt can drown bulbs.
  2. When planting bulbs in the fall, add a high phosphorus fertilizer to the planting hole for the development of strong roots. This will help the bulbs establish well so they can renew themselves each year.
  3. Bulb foliage will often break through the soil after a few warm winter days. This vegetation is hardy and its exposure to the cold will not damage your plants or prevent them from blooming. There is no need to cover, wrap or otherwise protect this initial foliage.
  4. Fertilize bulbs as plants are emerging from the ground. Do not fertilize once flowers appear. Use a 5-10-5 granular fertilizer to assist in foliage and flower development, ideally one that is formulated especially for bulbs.
  5. After blooming, cut back the flower stalk. This will force the plant to put its energy into the bulb for next year’s flowers and not into seed production that would dampen the strength of the bulb.
  6. Allow the leaves to die back naturally. The leaves are vital for producing food that is stored in the bulb for next year’s growth. Cut leaves, never pull, once they have turned yellow – pulling can damage the bulb. Do not tie leaves as this reduces the leaf surface required for adequate food production.
  7. When the foliage has completely died back the bulb is dormant, and this is the proper time to dig and separate bulbs if necessary. Flowering will often be reduced when bulb beds become over-crowded. If division is needed, bulbs should be dug and stored in a cool, dry, well-ventilated place and replanted in the fall.
  8. Fertilize bulbs again in the fall with a high-phosphorus, granular fertilizer.

With thoughtful care, you can easily help your bulbs reach their full potential and they will thrive for many years.

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Pre-Emergent Control of Crabgrass

Did you have a crabgrass problem last year? Well, chances are, it’s gonna be even worse this year! Crabgrass is an annual lawn weed that dies once a hard frost hits. The main problem with this pest is the tenacious seed that it leaves behind after it blooms.

Early spring is the season to control crabgrass with a pre-emergent herbicide. This chemical works by killing the crabgrass seedlings as they germinate. Here’s what you need to do:

  • Apply the pre-emergent as the forsythia is going out of bloom.
  • For newly seeded lawns, wait until you have mowed your lawn three times before applying the herbicide. This will help to avoid killing the new grass.
  • Use a spreader to apply the herbicide uniformly across your lawn.
  • Apply your pre-emergent before a light rain. This will knock the chemical off the grass blades and down to the soil surface where the crabgrass seed is germinating.
  • Do not de-thatch or aerate the lawn after applying the herbicide, as this disruption will break the chemical barrier.
  • Wait two to four months to re-seed the lawn after applying.
  • Repeat this same procedure year after year.
  • Keep you and your lawn safe. Always follow the manufacturers’ instructions.
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