Coastal Gardening Tips for March

Wilmington & Coastal North Carolina
March is a month of transition in the Cape Fear region. While the afternoon sun feels warm, it is important to remember that we still have a significant potential for frost. Don't let a few warm days fool you into rushing your planting; jumping the gun can lead to losing tender plants to a late-season cold snap.
Coastal Wake-Up: Pollinators & Early Blooms
As temperatures rise, beneficial insects begin emerging from their winter hiding spots. Many native bees, moths, and beetles overwinter in fallen leaves, hollow stems, and even shallow soil. If you can, hold off on major yard clean-up until late March to protect these important pollinators.
Early wildflowers are already blooming around Wilmington. Watch for:
- Wild violets
- Henbit
- Clover
These small flowers provide essential nectar for newly active pollinators.
Start Your Warm-Season Vegetables
Now is the time to start seeds indoors for crops that need a longer growing season. By starting them inside, you protect them from the unpredictable coastal frost:
- Tomatoes
- Peppers
- Summer squash
- Cucumbers
- Melons
Keep seedlings warm and in bright light indoors, in a greenhouse, or under a clear humidity dome. Starting early gives plants a head start and can help them produce before peak insect and disease pressure arrives in late summer. Wait to transplant tomatoes and peppers outdoors until after Wilmington’s average last frost date (typically mid-April).
Cool-Season Crops for March
March is ideal for planting cool-season vegetables and herbs directly in the garden, as these can handle a light frost:
- Lettuce and Spinach
- Kale and Chard
- Radishes (sow every 1–2 weeks for continuous harvest)
- Carrots and Beets
- Peas
- Cilantro and Parsley
Transplants such as broccoli, cabbage, and kale can go into the garden beginning mid-month. If dry conditions continue this spring, consider installing drip irrigation to conserve water and deliver it efficiently to plant roots.
Drought Awareness
Southeastern North Carolina has experienced periods of below-average rainfall this winter. As plants break dormancy, monitor soil moisture closely. Even established plants may need supplemental watering if dry conditions persist into April.
For lawns and gardens:
- Apply about 1 inch of water per week when rainfall is insufficient.
- Water deeply and less frequently to encourage strong root systems.
Warm-Season Lawn Care (Bermuda, Zoysia, Centipede, St. Augustine)
- Do not fertilize until the lawn is fully greened up (usually May).
- Apply pre-emergent herbicide for summer weeds when daytime temperatures consistently reach 65–70°F for several days in a row (often March).
- Avoid combination “weed-and-feed” products this month.
Weeds are often a sign your lawn is stressed. Focus on proper mowing height, correct watering, and soil health rather than relying solely on herbicides.
Trees & Shrubs
Time is running short to prune many trees and shrubs before new growth fully emerges.
Prune in Early March:
- Hydrangeas: Be very careful when pruning hydrangeas. Varieties like Panicle (Limelight) and Smooth hydrangeas bloom on new wood and should be pruned now. However, Bigleaf (mophead) and Oakleaf hydrangeas bloom on second-year wood (old wood); pruning them now will remove this year's flower buds.
- Butterfly bush
- Rose of Sharon
- Beautyberry
- Repeat-blooming roses (such as Knock Out®, floribundas, hybrid teas, shrub roses)
Wait to prune old garden roses and climbing roses until after they bloom. If you're unsure what type of rose or hydrangea you have, identify it before cutting to avoid removing this year’s flowers.
Landscape Additions for Four-Season Interest
March is a great time to add new plants to your landscape. Consider species that offer multi-season appeal:
Groundcovers
Moss phlox – A low-growing evergreen that blooms in vibrant pinks and purples from late winter into early spring. Excellent for rock walls and slopes.
Native Shrub Spotlight
Witch Hazel (Hamamelis) – A unique native shrub that provides color when almost everything else is dormant.
- Blooms: Many varieties are in full bloom right now, featuring fragrant, ribbon-like petals in shades of yellow, orange, or red.
- Winter Interest: Its unusual flowering habit makes it a standout in the late winter and early spring landscape.
- Fall: Offers lovely golden-yellow foliage before the leaves drop.
- Habit: Thrives in moist, well-drained soil and works well in woodland borders.
Edible Landscaping
Blend beauty and function by adding:
- Rosemary (upright or creeping)
- Elderberry
- Serviceberry
- Fig trees
Houseplants & Transplants
If moving plants outdoors for the season, acclimate them gradually. Sudden exposure to full sun can cause leaf scorch or “sunburn.” Additionally, keep an eye on the overnight forecast; if a frost is predicted, bring these plants back inside immediately.
Flower Garden Care
March is an excellent month to divide many perennials, including Black-eyed Susans, daylilies, hostas, and mums. You can also plant cool-season annuals such as:
- Sweet alyssum
- Lobelia
- Johnny-jump-ups
- Nasturtiums
- Snapdragons
These will bloom beautifully until summer heat arrives. Fertilize established spring bulbs like daffodils, crocus, and hyacinths with a bulb fertilizer as they finish blooming.
Mulch & Soil Testing
Apply mulch in landscape beds to suppress weeds, retain soil moisture, and moderate soil temperatures. Vegetable gardens especially benefit from mulch to reduce competition for water and nutrients.
Before heavy planting begins, have your soil tested. A soil test provides precise recommendations for fertilizer and lime, saving money and preventing over-application. Samples can be submitted through your local Cooperative Extension office. 🌱🌸
Recent Posts







