Delaware’s coastal climate and sandy loam soils support early-season tomato varieties that mature before peak summer humidity. If you are looking for the best tomatoes to grow in delaware, you need varieties that handle humidity, resist disease, and ripen fast. This guide covers top picks for the First State’s unique growing conditions.
Delaware sits in USDA hardiness zones 7a and 7b, which means a long growing season but also high humidity. Your tomato plants will face diseases like blight and blossom end rot if you choose the wrong type. Stick with proven performers that thrive in Delaware’s soil and weather.
Best Tomatoes To Grow In Delaware
The best tomatoes to grow in delaware are determinate and semi-determinate varieties that set fruit before the heat peaks. Early Girl, Celebrity, and Rutgers are top choices. These plants produce reliable harvests even when summer humidity spikes.
Heirloom tomatoes can work if you pick disease-resistant strains. Cherokee Purple and Brandywine do well in Delaware’s sandy loam, but they need extra care. For beginners, hybrid varieties offer more tolerance to local pests and fungal issues.
Early Season Varieties For Delaware Gardens
Early season tomatoes mature in 50 to 65 days. They are perfect for Delaware’s spring planting window. Start seeds indoors in late March or early April for transplanting after the last frost, which typically occurs around mid-April.
- Early Girl: Matures in 50 days. Produces medium-sized red fruits with classic flavor. Handles cool spring soil well.
- Sub Arctic Plenty: Ready in 45 days. Small fruits but very cold tolerant. Great for northern Delaware.
- Stupice: Heirloom from Czechoslovakia. Matures in 55 days. Produces sweet, tangy fruits even in cooler weather.
- Fourth of July: Hybrid that ripens in 49 days. Bred for early harvests in coastal climates.
Plant these early varieties in full sun with well-drained soil. Space them 24 to 36 inches apart. Water at the base to prevent leaf diseases common in Delaware’s humid summers.
Main Season Tomatoes That Handle Humidity
Main season tomatoes mature in 65 to 80 days. They need consistent care during Delaware’s hottest months. Choose varieties bred for disease resistance, especially against early blight and septoria leaf spot.
- Celebrity: Hybrid determinate. Resistant to verticillium wilt and fusarium wilt. Produces 8-ounce fruits with balanced flavor.
- Rutgers: Classic Jersey tomato. Developed for the Mid-Atlantic region. Tolerates humidity and produces meaty fruits.
- Better Boy: Indeterminate hybrid. High yield of 10-ounce fruits. Resistant to nematodes and tobacco mosaic virus.
- Big Beef: All-American winner. Large fruits up to 12 ounces. Excellent disease package for Delaware gardens.
- Mountain Merit: Determinate with late blight resistance. Perfect for Kent and Sussex counties where humidity is highest.
Mulch around your plants with straw or shredded leaves. This keeps soil moisture even and reduces splashing that spreads disease. Delaware’s sandy loam drains fast, so water deeply twice a week during dry spells.
Heirloom Tomatoes For Flavor Lovers
Heirloom tomatoes offer unmatched taste but require more attention in Delaware’s climate. They lack the disease resistance of hybrids. Grow them in raised beds or containers for better drainage and air circulation.
- Cherokee Purple: Dark purple-brown fruits with rich, smoky flavor. Needs staking and consistent watering to prevent cracking.
- Brandywine: Large pink fruits up to 1.5 pounds. Very sweet but slow to mature (85 days). Best for southern Delaware where season is longer.
- Black Krim: Russian heirloom with salty-sweet taste. Handles heat better than most heirlooms. Fruits are medium-sized with green shoulders.
- Amish Paste: Plum-shaped tomato for sauces. Produces heavily in Delaware’s sandy soil. Resistant to cracking.
Heirlooms need regular pruning to improve air flow. Remove lower leaves once plants reach 12 inches tall. This reduces fungal spores splashing onto leaves during rain.
Cherry And Grape Tomatoes For Reliable Harvests
Small-fruited tomatoes are the most reliable for Delaware gardeners. They ripen quickly and resist many diseases. Kids love them, and they are perfect for salads and snacking.
- Sweet 100: Indeterminate cherry tomato. Produces hundreds of sweet red fruits. Very vigorous and disease-tolerant.
- Sun Gold: Orange cherry tomato with candy-like sweetness. Matures in 57 days. Needs sturdy support due to heavy yields.
- Jasper: Red cherry tomato bred for disease resistance. Tolerates late blight and powdery mildew. Great for coastal gardens.
- Black Cherry: Heirloom with dark purple skin and complex flavor. Does well in Delaware’s heat if mulched heavily.
- Tiny Tim: Dwarf determinate variety. Grows only 12 inches tall. Perfect for containers on patios or balconies.
Plant cherry tomatoes in groups of three for pollination. They attract bees and other pollinators to your garden. Harvest daily once they start ripening to keep plants producing.
Paste Tomatoes For Sauces And Canning
Delaware’s sandy loam is ideal for paste tomatoes because they need less water than slicing varieties. These tomatoes have thick walls and few seeds. They are perfect for making sauce, salsa, and canned goods.
- Roma: Classic paste tomato. Determinate plant that sets fruit all at once. Good for canning in bulk.
- San Marzano: Italian heirloom with elongated fruits. Sweeter than Roma. Needs staking to support heavy clusters.
- Amish Paste: Large fruits up to 8 ounces. Meaty with few seeds. Does well in Delaware’s heat.
- Opalka: Polish heirloom with pear-shaped fruits. Very productive in sandy soil. Resistant to blossom end rot.
- Pozzano: Hybrid paste tomato with high yields. Resistant to fusarium and verticillium wilts.
Paste tomatoes need consistent watering to prevent blossom end rot. Add calcium to your soil before planting. Delaware’s soil often lacks calcium, so use crushed eggshells or gypsum.
Growing Tips For Delaware’s Climate
Delaware’s coastal location brings unique challenges. Humidity, salt spray, and variable spring temperatures affect tomato growth. Follow these tips for a successful harvest.
Soil Preparation
Test your soil pH before planting. Tomatoes prefer pH between 6.0 and 6.8. Delaware’s sandy loam is often acidic, so add lime if needed. Mix in 2 inches of compost to improve water retention.
Raised beds warm up faster in spring. They also drain better during heavy rain. Build beds 8 to 12 inches high for best results in clay-heavy areas of New Castle County.
Planting Timing
Wait until soil temperature reaches 60°F at 4 inches deep. In Delaware, this usually happens by May 1 in southern counties and May 15 in northern areas. Use black plastic mulch to warm soil faster.
Plant tomatoes deep. Bury the stem up to the first set of leaves. Roots will form along the buried stem, creating a stronger plant. This is crucial for Delaware’s sandy soil that drains quickly.
Watering Strategies
Water deeply but infrequently. Aim for 1 to 2 inches per week. Drip irrigation is best because it keeps leaves dry. Overhead watering spreads fungal diseases common in Delaware’s humid summers.
Water in the morning so foliage dries by nightfall. Evening watering leaves plants wet overnight, which encourages blight. Check soil moisture by sticking your finger 2 inches deep.
Disease Prevention
Delaware’s humidity promotes early blight, late blight, and septoria leaf spot. Choose resistant varieties when possible. Rotate tomato crops every three years to prevent soil-borne diseases.
Space plants 24 to 36 inches apart for good air flow. Prune suckers from indeterminate varieties. Remove lower leaves once plants reach 18 inches tall. This reduces disease pressure significantly.
Container Gardening For Small Spaces
Many Delaware gardeners grow tomatoes in containers on patios or decks. This works well for apartment dwellers or those with poor soil. Choose determinate or dwarf varieties for best results.
- Bush Early Girl: Compact determinate. Grows 24 inches tall. Produces full-sized fruits in 54 days.
- Patio Princess: Dwarf variety bred for pots. Matures in 60 days. Fruits are 4 ounces with good flavor.
- Tumbling Tom: Trailing variety for hanging baskets. Produces cherry tomatoes all summer. Very disease-resistant.
- Red Robin: Micro dwarf that grows 8 inches tall. Perfect for windowsills. Fruits are small but sweet.
Use pots at least 5 gallons in size. Delaware’s heat dries out small containers quickly. Add a layer of mulch on top to retain moisture. Water daily during hot spells.
Harvesting And Storage Tips
Pick tomatoes when they are fully colored but still firm. Delaware’s humidity can cause overripe fruits to split. Harvest every two days during peak season.
Store tomatoes at room temperature, not in the refrigerator. Cold storage ruins flavor and texture. Keep them stem-side down on a counter for up to a week.
If frost threatens in early October, pick all green tomatoes. Wrap them in newspaper and store in a cool, dark place. They will ripen slowly over several weeks.
Common Problems And Solutions
Even with the best tomatoes to grow in delaware, problems can arise. Here are common issues and how to fix them.
- Blossom end rot: Dark, leathery spots on the bottom of fruits. Caused by calcium deficiency and uneven watering. Add calcium to soil and water consistently.
- Cracking: Radial or concentric cracks on fruits. Caused by rapid water uptake after dry spells. Mulch heavily and water regularly.
- Catfacing: Deformed fruits with scars. Caused by cold temperatures during flowering. Plant after soil warms fully.
- Hornworms: Large green caterpillars that defoliate plants. Hand-pick them or use Bt spray. Check plants daily in July and August.
- Whiteflies: Tiny white insects on leaf undersides. Use insecticidal soap or neem oil. Delaware’s humidity favors their reproduction.
Monitor your plants weekly. Early detection makes problems easier to manage. Remove diseased leaves immediately to prevent spread.
Recommended Varieties By County
Delaware’s three counties have slightly different climates. New Castle County is cooler with more clay soil. Kent County has moderate humidity. Sussex County is warmest with sandy soil and salt spray.
- New Castle County: Early Girl, Stupice, Celebrity, Mountain Merit. Focus on early maturing varieties due to shorter season.
- Kent County: Rutgers, Better Boy, Amish Paste, Sun Gold. Balanced conditions allow more variety choices.
- Sussex County: Cherokee Purple, Brandywine, Roma, Jasper. Longer season supports late-maturing heirlooms and paste tomatoes.
Coastal gardeners in Sussex County should plant windbreaks to protect tomatoes from salt spray. Use row covers or plant near fences. Salt damage causes leaf burn and stunted growth.
Seed Starting Guide For Delaware
Start tomato seeds indoors 6 to 8 weeks before the last frost. In Delaware, this means starting seeds in mid-March for most areas. Use seed starting mix and keep soil warm at 70°F.
- Fill trays with moistened seed starting mix.
- Sow seeds 1/4 inch deep, two per cell.
- Cover with plastic wrap to retain humidity.
- Place under grow lights or in a sunny window.
- Remove plastic once seedlings emerge (5-10 days).
- Thin to one seedling per cell after true leaves appear.
- Harden off plants for 7 days before transplanting.
Harden off by placing seedlings outside for a few hours daily. Increase time gradually over a week. This prevents transplant shock in Delaware’s variable spring weather.
Fertilizing For Maximum Yield
Tomatoes are heavy feeders. Delaware’s sandy soil leaches nutrients quickly. Fertilize regularly for best production.
- At planting: Mix slow-release fertilizer into soil. Use a 10-10-10 formula.
- After first fruits set: Switch to low-nitrogen fertilizer like 5-10-10. Too much nitrogen causes lush foliage but few fruits.
- Every two weeks: Apply liquid fertilizer like fish emulsion or seaweed extract.
- Mid-season: Side-dress with compost or aged manure. This replenishes nutrients washed out by rain.
Stop fertilizing once temperatures consistently exceed 90°F. Heat stress reduces nutrient uptake. Resume when cooler weather returns in September.
Companion Planting For Delaware Gardens
Plant companions near your tomatoes to improve growth and repel pests. Delaware’s diverse insect population benefits from strategic planting.
- Basil: Repels aphids and whiteflies. Improves tomato flavor. Plant 12 inches away.
- Marigolds: Deter nematodes in soil. French marigolds work best. Plant around tomato bed edges.
- Nasturtiums: Trap aphids away from tomatoes. Grow as a sacrificial plant.
- Borage: Attracts pollinators and repels tomato hornworms. Also adds calcium to soil.
- Garlic: Deters spider mites and fungal diseases. Plant between tomato rows.
Avoid planting tomatoes near fennel or potatoes. Fennel inhibits tomato growth. Potatoes share blight diseases with tomatoes.
Season Extension Techniques
Delaware’s growing season runs from April to October. Use season extension to harvest earlier and later. This is especially useful for northern New Castle County.
- Wall O’ Water: Plastic tepees filled with water. They store heat overnight. Use for early planting in March.
- Row Covers: Lightweight fabric that protects from frost and wind. Remove when flowers appear for pollination.
- Cold Frames: Simple boxes with glass or plastic tops. Start seeds earlier or extend harvest into November.
- High Tunnels: Unheated greenhouse structures. Allow year-round tomato growing in protected environment.
Season extension works best for determinate varieties that ripen all at once. Indeterminate varieties keep producing until frost, so they benefit less from late-season protection.
Frequently Asked Questions
What are the best tomatoes to grow in Delaware for beginners?
Celebrity, Early Girl, and Sun Gold are easiest for new gardeners. They resist disease and produce reliably in Delaware’s climate.
Can I grow heirloom tomatoes in Delaware’s humidity?
Yes, but choose resistant varieties like Cherokee Purple or Black Krim. Provide good air flow and use drip irrigation to reduce disease risk.
When should I plant tomatoes in Delaware?
Transplant after the last frost, usually mid-April to mid-May depending on your county. Soil temperature should be at least 60°F.
How do I prevent blossom end rot in Delaware soil?
Add calcium before planting and water consistently. Delaware’s sandy soil drains fast, so mulch heavily and water deeply twice weekly.
What tomato varieties resist late blight in Delaware?
Mountain Merit, Jasper, and Defiant PhR have strong late blight resistance. These are excellent for coastal areas with high humidity.
Final Thoughts On Delaware Tomato Growing
Choosing the best tomatoes to grow in delaware means matching varieties to your specific conditions. Early and main-season hybrids work best for most gardens. Heirlooms offer superior flavor but need extra care.
Start with disease-resistant varieties like Celebrity or Early Girl. Add cherry tomatoes for reliable harvests. Experiment with one or two heirlooms if you have space and patience.
Delaware’s sandy loam and coastal climate are actually ideal for tomatoes if you manage water and disease properly. With the right varieties and care, you will enjoy fresh tomatoes from July through October. Happy growing in the First State.