Best Time To Plant Nasturtium In Maryland

Planting nasturtium in Maryland works best once the soil temperature reaches at least 60 degrees Fahrenheit. The best time to plant nasturtium in Maryland is typically between mid-April and mid-May, depending on your specific zone. These cheerful flowers thrive in the state’s transition from cool spring to warm summer.

Nasturtiums are one of the easiest flowers to grow from seed. They don’t like cold soil or frost. If you plant too early, the seeds may rot. Wait until the ground warms up naturally.

Maryland’s climate varies a lot. Western Maryland is cooler. The Eastern Shore is warmer. Your planting window shifts by a few weeks depending on where you live.

Understanding Maryland’s Growing Zones

Maryland spans USDA hardiness zones 5b through 8a. This affects when you can safely plant nasturtiums. The state has three main regions with different frost dates.

Western Maryland (Zones 5B-6A)

This area includes Garrett, Allegany, and Washington counties. Winters are colder. Spring arrives later. The last frost often happens in early May.

Plant nasturtiums here from mid-May to early June
Soil warms slowly in mountain areas
Use black plastic to warm soil faster if needed

Central Maryland (Zones 6B-7A)

This covers Baltimore, Howard, and Montgomery counties. Spring is moderate. Last frost usually occurs in mid-April.

Plant from late April to mid-May
Watch for late cold snaps in April
Seeds germinate in 7-10 days with warm soil

Eastern Shore And Southern Maryland (Zones 7B-8A)

These areas are warmer. Last frost comes earlier, often by late March. You can plant nasturtiums earlier here.

Plant from early April to early May
Soil reaches 60°F by early April most years
Second planting in late summer for fall bloom

The exact timing depends on soil temperature, not just the calendar. Use a soil thermometer for best results. Stick it two inches deep in the ground. Check it in the morning before the sun heats the surface.

When the soil reads 60°F consistently for three days, it’s safe to plant. In most of Maryland, this happens between April 20 and May 10. Coastal areas may reach this temperature by April 10.

You can also plant in late summer for a fall display. Plant seeds in early August. They’ll bloom until the first frost in October or November.

Checking Soil Temperature Correctly

Buy a soil thermometer at any garden center
Take readings at 9 AM before the sun heats the soil
Measure at two inches deep where seeds will sit
Take readings for three consecutive days
Plant only when all three readings are at least 60°F

If you don’t have a thermometer, watch for signs. When dandelions bloom and oak leaves are the size of a mouse’s ear, soil is usually warm enough. This old farmer’s trick works well in Maryland.

How To Plant Nasturtium Seeds In Maryland

Nasturtiums grow best from direct sowing. They don’t transplant well. Their roots are sensitive. Start them right in the garden bed.

Step-By-Step Planting Guide

Choose a sunny spot with well-draining soil
Soak seeds in water overnight to speed germination
Plant seeds one inch deep
Space seeds 10-12 inches apart for bush types
Space seeds 18-24 inches apart for trailing types
Water gently after planting
Keep soil moist but not waterlogged

Seeds germinate in 7-14 days when soil is warm. Cooler soil takes longer. If you plant in mid-April in central Maryland, expect sprouts by early May.

Soil Preparation Tips

Nasturtiums prefer poor to average soil. Too much fertilizer makes them grow leaves instead of flowers. Don’t add compost or manure before planting.

Test soil pH; aim for 6.0 to 7.0
Remove rocks and large clumps
Rake soil smooth before planting
Water the bed a day before planting

Growing Nasturtiums Successfully In Maryland’s Climate

Maryland summers can be hot and humid. Nasturtiums handle heat but need some care. They bloom best in temperatures between 65°F and 75°F. When it gets above 85°F, they may slow down.

Watering Needs

Water deeply once a week if there’s no rain. Maryland gets about 40 inches of rain yearly. Spring is usually wet enough. Summer may require extra watering.

Water at the base to avoid leaf diseases
Morning watering is best
Don’t let soil dry out completely
Mulch around plants to retain moisture

Sunlight Requirements

Nasturtiums need full sun for best blooms. In Maryland, that means at least 6 hours of direct sunlight. Afternoon shade is fine in hotter parts of the state.

Too much shade makes plants leggy with few flowers. If your garden has partial shade, choose a spot that gets morning sun.

Common Problems When Planting Nasturtiums In Maryland

Even with perfect timing, issues can arise. Here are the most common problems Maryland gardeners face.

Aphids

Aphids love nasturtiums. In fact, many gardeners use nasturtiums as trap plants to lure aphids away from vegetables. If you see clusters of small green insects, spray them off with water.

Check undersides of leaves weekly
Use a strong stream from a hose
Neem oil works if infestations are heavy
Ladybugs are natural predators

Powdery Mildew

Humid Maryland summers can cause powdery mildew. It looks like white powder on leaves. Prevent it with good air circulation.

Space plants properly
Water at soil level, not overhead
Remove affected leaves promptly
Use a baking soda spray if needed

Poor Blooming

If your nasturtiums have lots of leaves but few flowers, the soil is too rich. They bloom best in lean soil. Also check for too much shade.

Don’t fertilize
Move plants to a sunnier spot next year
Cut back on watering slightly
Deadhead spent flowers to encourage more

Varieties Of Nasturtiums For Maryland Gardens

Different varieties perform differently in Maryland’s climate. Choose based on your space and needs.

Dwarf Or Bush Varieties

These grow 12-15 inches tall. They’re perfect for borders and containers. They bloom earlier than trailing types.

‘Alaska’ series has variegated leaves
‘Whirlybird’ series has upward-facing flowers
‘Tom Thumb’ is compact and early blooming

Trailing Or Climbing Varieties

These vines can reach 6-8 feet long. They’re great for trellises, fences, or hanging baskets. They bloom later but longer.

‘Jewel’ series has double flowers
‘Empress of India’ has dark leaves and red flowers
‘Moonlight’ has pale yellow blooms

Edible Varieties

All nasturtiums are edible, but some have better flavor. The flowers and leaves have a peppery taste. Use them in salads or as garnish.

‘Peach Melba’ has creamy flowers with red centers
‘Cherry Rose’ has deep pink blooms
‘Salmon Baby’ has soft orange flowers

Companion Planting With Nasturtiums In Maryland

Nasturtiums are excellent companion plants. They repel certain pests and attract beneficial insects. Maryland gardeners often plant them near vegetables.

Best Companions

Cucumbers and squash – nasturtiums repel cucumber beetles
Tomatoes – they deter whiteflies
Cabbage family – they repel cabbage worms
Beans and peas – they attract pollinators

Plants To Avoid

Nasturtiums don’t have many bad neighbors. But avoid planting them near fennel, which can inhibit growth. Also keep them away from heavy feeders like corn.

Harvesting And Using Nasturtiums

You can harvest flowers and leaves throughout the growing season. Pick them in the morning when they’re freshest. Use them within a day for best flavor.

How To Harvest

Pick flowers when fully open
Choose young, tender leaves
Leave at least half the plant to keep growing
Rinse gently in cool water
Pat dry with a paper towel

Culinary Uses

Nasturtiums add color and spice to dishes. The flowers are beautiful in salads. The leaves can be used like watercress.

Stuff flowers with goat cheese for appetizers
Add leaves to sandwiches for a peppery kick
Use flowers to garnish soups and platters
Make nasturtium vinegar by steeping flowers in white vinegar

Extending The Bloom Season In Maryland

With careful planning, you can enjoy nasturtiums from late spring until frost. Here’s how to stretch the season.

Succession Planting

Plant seeds every two weeks from your first planting date until mid-July. This ensures continuous blooms. New plants replace older ones that may fade in summer heat.

First planting: mid-April to early May
Second planting: late May
Third planting: mid-June
Fourth planting: early July for fall bloom

Fall Planting

Nasturtiums thrive in cool fall weather. Plant seeds in early August for September and October blooms. They often look better than spring plants because temperatures are milder.

In southern Maryland, fall-planted nasturtiums may bloom until November. In western Maryland, the first frost usually ends the season by mid-October.

Overwintering Nasturtiums In Maryland

Nasturtiums are annuals in Maryland. They won’t survive winter outdoors. But you can save seeds for next year.

Saving Seeds

Let some flowers go to seed in late summer
Seeds form in green capsules that turn brown
Pick the capsules when they’re dry and crumbly
Remove seeds and let them dry for a week
Store in a paper envelope in a cool, dark place

Seeds remain viable for 3-5 years. Label them with the variety and year. Plant them next spring following the same timing guidelines.

Frequently Asked Questions

Can I Plant Nasturtiums In Maryland In July?

Yes, you can plant in July for fall blooms. The soil is warm enough. Just keep seeds well-watered during hot weather. They’ll bloom in September and October.

What Happens If I Plant Nasturtiums Too Early In Maryland?

Seeds may rot in cold, wet soil. They won’t germinate until soil reaches 60°F. If a frost hits after sprouting, the plants will die. Wait for consistent warmth.

Do Nasturtiums Need Full Sun In Maryland?

They need at least 6 hours of sun for best blooms. In hotter parts of Maryland, afternoon shade helps them last longer. Too much shade reduces flowering.

How Deep Should I Plant Nasturtium Seeds In Maryland?

Plant seeds one inch deep. Cover them lightly with soil. Press down gently to ensure good contact. Water well after planting.

Can I Start Nasturtium Seeds Indoors In Maryland?

It’s possible but not recommended. Nasturtiums have sensitive roots that don’t like transplanting. Direct sowing in the garden is much more successful.

Final Tips For Maryland Gardeners

Nasturtiums are forgiving plants. Even if your timing is off by a week or two, they usually still grow well. The key is avoiding frost and cold soil.

Keep a garden journal. Note when you planted and when blooms appeared. Over a few years, you’ll learn the perfect window for your specific location in Maryland.

Don’t be afraid to experiment. Try planting a few seeds two weeks before your main batch. If they survive, you can plant earlier next year. If not, you haven’t lost much.

Nasturtiums also self-seed if you let them. Some gardeners get volunteer plants the next spring. These often appear at the perfect time because nature knows best.

Enjoy the bright flowers and peppery leaves. They’re one of the most rewarding plants for Maryland gardens. With the right timing, you’ll have blooms from spring until the first frost.