Delaware’s coastal influences mean planting lavender in mid-spring, when ocean breezes moderate temperature swings. The best time to plant lavender in Delaware is typically between mid-April and late May, after the last frost has passed and the soil has warmed to at least 60°F. This timing gives your lavender plants the best chance to establish strong roots before the humid summer heat arrives.
Lavender loves sun and well-drained soil. In Delaware, the key is avoiding the wet, cold ground of early spring and the scorching heat of July. Planting at the right time sets you up for success with this Mediterranean herb.
Best Time To Plant Lavender In Delaware
For most gardeners in the First State, the sweet spot for planting lavender is from April 15th to May 20th. This window aligns with the average last frost date, which ranges from April 10th in southern Delaware to April 25th in the northern part of the state. Coastal areas near Lewes or Rehoboth Beach can sometimes plant a week earlier because the ocean moderates the temperature.
You can also plant lavender in early fall, from late August to mid-September. Fall planting gives the roots time to grow before winter dormancy. But spring planting is more reliable for beginners because the plants have a full growing season to get established.
Why Timing Matters For Lavender In Delaware
Lavender is not a native plant to Delaware. It comes from the dry, rocky hills of the Mediterranean. This means it has specific needs that differ from many garden flowers. If you plant too early, cold, wet soil can rot the roots. If you plant too late, the summer humidity and heat can stress the plant before it has a strong root system.
Delaware’s climate is in USDA hardiness zones 7a and 7b. This is actually good for lavender, as it prefers mild winters and warm summers. But the humidity along the coast and in inland areas like Dover or Newark can be a challenge. Proper timing helps the plant cope with these conditions.
Checking Soil Temperature
Before you plant, check your soil temperature. Lavender roots need soil that is at least 60°F (15°C) at a depth of 4 inches. You can buy a simple soil thermometer at any garden center. If the soil feels cold and damp to the touch, wait another week. Planting in cold soil is the number one reason lavender fails in Delaware.
Watching The Weather Forecast
Keep an eye on the 10-day forecast. Avoid planting if a late frost is predicted. Even though lavender is somewhat cold-hardy, young plants are vulnerable to frost damage. If a frost warning comes after you have planted, cover your lavender with a frost cloth or an old bedsheet overnight.
Step-By-Step Guide To Planting Lavender In Delaware
Follow these steps to give your lavender the best start. This process works for both spring and fall plantings.
- Choose the right variety. Not all lavender types grow well in Delaware. English lavender (Lavandula angustifolia) is the most reliable. Varieties like ‘Hidcote’ and ‘Munstead’ are hardy and handle humidity better than others. French and Spanish lavender are more sensitive to cold and wet winters.
- Pick a sunny spot. Lavender needs at least 6 to 8 hours of direct sunlight every day. A south-facing slope or a spot near a south-facing wall is ideal. Avoid low areas where water pools after rain.
- Prepare the soil. Lavender needs alkaline, well-draining soil. Delaware’s soil is often clay-heavy and acidic. Mix in plenty of coarse sand, gravel, or perlite to improve drainage. Add a little lime to raise the pH to between 6.5 and 7.5. Do not add compost or manure; lavender prefers lean soil.
- Dig a wide hole. Make the hole twice as wide as the pot but no deeper. The top of the root ball should sit slightly above the soil line. This prevents water from collecting around the stem.
- Space plants properly. Give each plant 2 to 3 feet of space. Good air flow is critical in Delaware’s humid summers. Crowded plants are more likely to develop fungal diseases.
- Water in carefully. After planting, water deeply to settle the soil. Then do not water again until the top inch of soil is dry. Overwatering is a common mistake.
- Mulch with gravel. Do not use bark mulch. Bark holds moisture against the stem, which can cause rot. Instead, use a layer of small pebbles or crushed stone around the base. This reflects heat and keeps the crown dry.
Caring For Lavender Through Delaware’s Seasons
Once your lavender is planted at the right time, proper care will keep it healthy. Each season brings different challenges in Delaware.
Spring Care
In early spring, prune your lavender to shape it. Cut back the old growth, but do not cut into the woody stems. Leave about 2 inches of green growth. This encourages bushy new growth. Apply a light layer of gravel mulch if needed. Do not fertilize lavender. It thrives on neglect.
Summer Care
Summer in Delaware can be hot and humid. Water your lavender only during dry spells. A deep watering once every two weeks is usually enough. Water at the base of the plant, not overhead. Wet leaves in humid weather can lead to mold. Harvest the flowers in late June or July when the buds are just opening. Cut the stems long, leaving some green growth on the plant.
Fall Care
In fall, stop watering completely. Let the plant dry out naturally. Do not prune in fall. The old growth protects the plant from winter cold. If you planted in fall, water only once after planting, then leave it alone. The roots will grow slowly through the winter.
Winter Care
Lavender is hardy to about -10°F, so it usually survives Delaware winters without protection. But if you live in northern Delaware or have a exposed garden, cover the plants with a layer of straw or evergreen boughs after the ground freezes. Remove the cover in early spring. Do not use plastic covers; they trap moisture.
Common Problems When Planting Lavender In Delaware
Even with perfect timing, issues can arise. Here are the most common problems Delaware gardeners face and how to fix them.
- Root rot. This is the biggest killer of lavender in Delaware. It happens when the soil stays wet. Signs include yellowing leaves and a mushy stem. Prevention is the only cure: plant in well-drained soil and do not overwater.
- Fungal diseases. Humidity can cause leaf spot or powdery mildew. Space plants for good air flow. Water at the base. If you see spots, remove affected leaves. Do not use chemical fungicides; they can harm beneficial insects.
- Lack of blooms. If your lavender does not flower, it likely needs more sun. Move it to a sunnier spot. Too much nitrogen from fertilizer can also prevent blooms. Never fertilize lavender.
- Winter kill. Some varieties may die back in harsh winters. English lavender is the most winter-hardy. Mulching with gravel or straw helps protect the crown.
- Pests. Lavender is naturally pest-repellant. But spittlebugs or aphids may appear occasionally. Wash them off with a strong spray of water. They rarely cause serious damage.
Best Lavender Varieties For Delaware Gardens
Choosing the right variety is almost as important as choosing the best time to plant lavender in Delaware. Some types simply perform better in the state’s climate.
- English Lavender (Lavandula angustifolia) – This is the most reliable choice. Varieties like ‘Hidcote’ and ‘Munstead’ are compact, hardy, and fragrant. They bloom in early to mid-summer.
- Lavandin (Lavandula x intermedia) – These are hybrids that are larger and more heat-tolerant. ‘Grosso’ and ‘Provence’ are popular. They bloom later than English lavender. They are slightly less hardy but still do well in Delaware.
- Spanish Lavender (Lavandula stoechas) – This type has distinctive “rabbit ear” petals. It is less cold-hardy and more sensitive to humidity. It can be grown as an annual in Delaware or in pots that you move indoors for winter.
- French Lavender (Lavandula dentata) – This is not winter-hardy in Delaware. It is best grown in containers and brought inside during cold months.
Where To Buy Lavender Plants In Delaware
You can find lavender plants at local garden centers and nurseries. Look for healthy, green plants with no yellow leaves. Avoid plants that are root-bound or have dry soil. Some good local sources include:
- Gateway Garden Center in Hockessin
- Bennett’s Greenhouse in Townsend
- D&B Greenhouse in Dover
- Local farmers’ markets in spring
You can also order lavender online from reputable growers. But inspect the plants as soon as they arrive. Mail-order plants can sometimes be stressed.
Growing Lavender From Seed In Delaware
Starting lavender from seed is possible but requires patience. Seeds need cold stratification for 3 to 4 weeks before planting. Start seeds indoors 10 to 12 weeks before the last frost. Use a seed-starting mix and keep the soil moist but not wet. Lavender seeds germinate slowly, often taking 2 to 4 weeks. Once the seedlings have several sets of leaves, harden them off gradually before planting outdoors at the best time to plant lavender in Delaware.
Many gardeners find it easier to buy young plants from a nursery. But if you enjoy the challenge, growing from seed can be rewarding.
Using Lavender In Your Delaware Landscape
Lavender is not just a pretty plant. It has many uses in the garden and home. In Delaware’s landscape, lavender works well in:
- Rock gardens
- Herb gardens
- Border edges
- Container gardens
- Pollinator gardens (bees love lavender)
Plant lavender near walkways or patios where you can enjoy the scent. It also makes a good companion plant for roses, as it repels aphids. Avoid planting lavender near vegetables that need lots of water, like tomatoes or cucumbers. The watering needs are too different.
Harvesting And Drying Lavender
Harvest lavender in the morning after the dew has dried. Cut the stems when the lower flowers on the spike are just starting to open. This is when the oil content is highest. Bundle the stems with a rubber band and hang them upside down in a dark, dry, well-ventilated area. The flowers will dry in about two weeks. Store the dried lavender in an airtight jar away from sunlight.
You can use dried lavender for sachets, potpourri, cooking, or making lavender oil. The flowers also make a calming tea.
Frequently Asked Questions About Planting Lavender In Delaware
Can I plant lavender in Delaware in the summer?
It is not recommended. Summer heat and humidity stress young plants. If you must plant in summer, choose a cloudy day and water carefully. But spring or fall is much better.
Does lavender need full sun in Delaware?
Yes. Lavender needs at least 6 to 8 hours of direct sunlight daily. Less sun means fewer flowers and weaker growth. In Delaware’s humid climate, full sun also helps keep the plant dry and healthy.
How often should I water lavender in Delaware?
Water only when the top inch of soil is dry. In spring and fall, this may be once a week or less. In summer, water deeply every 10 to 14 days if there is no rain. Overwatering is the most common mistake.
Will lavender survive winter in Delaware?
Yes, English lavender and lavandin varieties are winter-hardy in Delaware’s zones 7a and 7b. They need well-drained soil and a gravel mulch to protect the crown. Avoid heavy clay soil that stays wet in winter.
What is the best lavender for Delaware’s humidity?
English lavender varieties like ‘Hidcote’ and ‘Munstead’ handle humidity best. Lavandin varieties like ‘Grosso’ are also good. Avoid French and Spanish lavender, which are more sensitive to moisture.
Final Tips For Success
Planting lavender at the best time is only the first step. Here are a few final reminders to help your lavender thrive in Delaware.
- Test your soil drainage before planting. Dig a hole, fill it with water, and see how long it takes to drain. If it takes longer than 4 hours, improve drainage or plant in a raised bed.
- Do not crowd your plants. Good air circulation is essential in humid weather.
- Prune lightly after flowering to keep the plant compact and encourage more blooms.
- Be patient. Lavender grows slowly in its first year. By the second year, it will be much larger and more productive.
- Enjoy the process. Lavender is a low-maintenance plant once established. The fragrance and beauty are worth the effort.
With the right timing and care, you can grow beautiful lavender in Delaware. The key is to plant in mid-spring, give it plenty of sun, and let the soil dry out between waterings. Follow these guidelines, and your lavender garden will be a success.