Maryland’s coastal influence extends the fall planting season well into September, making it a prime location for growing collard greens. Knowing the best time to plant collard greens in Maryland is key to a bountiful harvest, whether you are a beginner or a seasoned gardener.
Collard greens thrive in cool weather, and Maryland’s climate offers two distinct planting windows. The first is in early spring for a summer harvest, and the second, more reliable window is in late summer for a fall and winter crop.
Best Time To Plant Collard Greens In Maryland
For most gardeners in Maryland, the ideal planting window for collard greens is from mid-July to early September for a fall harvest. This timing allows the plants to mature during the cooler temperatures of autumn, which actually improves their flavor. A light frost makes collards sweeter, so don’t worry if temperatures drop.
Spring planting is also possible, but it requires careful timing. You want to plant seeds or transplants after the last frost date, which typically occurs between late March and mid-April in central Maryland. The exact date depends on your specific zone, which ranges from 5b in the western mountains to 8a on the Eastern Shore.
Understanding Maryland’s Growing Zones
Maryland spans USDA hardiness zones 5b through 8a. This variation affects planting times. Western Maryland (zones 5b-6a) has shorter, cooler summers, so fall planting should happen earlier, around mid-July. Central Maryland (zones 6b-7a) offers a wider window, from late July to late August. The Eastern Shore and southern Maryland (zones 7b-8a) can plant into early September.
Check your specific zone using an online USDA map. This small step prevents planting too late or too early, which can stunt growth or cause bolting in spring.
Spring Planting: Timing And Tips
For a spring harvest, plant collard greens 2 to 4 weeks before the last expected frost. In most of Maryland, this means mid-March to early April. You can start seeds indoors 4-6 weeks earlier and transplant them outside after hardening off.
- Direct sow seeds 1/2 inch deep in well-drained soil.
- Space plants 18-24 inches apart for good air flow.
- Water consistently, about 1-1.5 inches per week.
- Harvest outer leaves when they are 8-10 inches tall, usually 60-80 days after planting.
Spring-planted collards often bolt (go to seed) if temperatures spike early. To avoid this, choose bolt-resistant varieties like ‘Champion’ or ‘Flash.’
Fall Planting: The Optimal Window
Fall planting is the best time to plant collard greens in Maryland for several reasons. The cooler weather reduces pest pressure, and the flavor improves after frost. Aim to plant 6-8 weeks before the first expected frost, which is around mid-October in central Maryland. This means planting from mid-July to late August.
- Prepare soil with compost or aged manure for nutrients.
- Sow seeds directly or transplant seedlings 18-24 inches apart.
- Water deeply after planting to establish roots.
- Mulch around plants to retain moisture and regulate soil temperature.
- Thin seedlings to the strongest one per spot if direct sowing.
For a continuous harvest, stagger plantings every 2 weeks from mid-July through early September. This gives you fresh leaves from October through December, and sometimes into early spring if winter is mild.
Coastal Vs. Inland Maryland
Maryland’s coastal areas, like the Eastern Shore and around the Chesapeake Bay, have milder winters and longer growing seasons. Here, you can plant collards as late as mid-September and still get a good harvest. The ocean’s moderating effect keeps temperatures from dropping too quickly.
Inland areas, including the Piedmont and western mountains, have colder winters. Planting must be done by mid-August to ensure plants mature before hard freezes. Use row covers or cold frames to extend the season by 4-6 weeks.
Soil Preparation And Care
Collard greens prefer fertile, well-drained soil with a pH between 6.0 and 7.5. Test your soil a few weeks before planting. Add lime if pH is too low, or sulfur if too high. Work in 2-3 inches of organic matter, like compost, to improve structure and nutrients.
- Fertilize with a balanced 10-10-10 fertilizer at planting time.
- Side-dress with nitrogen-rich fertilizer (like blood meal) when plants are 6 inches tall.
- Water at the base to avoid leaf diseases; use drip irrigation if possible.
- Weed regularly to reduce competition for nutrients.
Collards are heavy feeders. They need consistent moisture and nutrients to produce tender leaves. Mulching with straw or grass clippings helps retain moisture and keeps roots cool.
Pest And Disease Management
Common pests in Maryland include cabbage worms, aphids, and flea beetles. Use row covers to protect young plants. Handpick caterpillars or spray with neem oil for organic control. Aphids can be washed off with a strong stream of water.
Diseases like clubroot and downy mildew are less common but can occur. Rotate crops yearly, avoid overhead watering, and ensure good air circulation. If you see yellowing leaves or stunted growth, remove affected plants immediately.
Harvesting And Storage
Harvest collard greens when the outer leaves are 8-12 inches long. Pick from the bottom up, leaving the inner leaves to continue growing. This method extends your harvest for weeks. In Maryland, fall-planted collards can be harvested into December, and sometimes through winter with protection.
Store fresh collards in the refrigerator for up to 5 days. Wash and dry them thoroughly before storing in a plastic bag with a paper towel. For longer storage, blanch and freeze the leaves for up to 6 months.
Varieties Best Suited For Maryland
Choose varieties that tolerate both heat and cold for Maryland’s variable climate. ‘Georgia Southern’ is a classic, heat-tolerant variety that does well in spring and fall. ‘Champion’ is bolt-resistant and compact, perfect for small gardens. ‘Vates’ is a heirloom that handles frost well and produces tender leaves.
For a unique option, try ‘Morris Heading,’ which forms a loose head and is very cold-hardy. ‘Flash’ is a fast-growing hybrid that matures in 55 days, ideal for late summer planting.
Common Mistakes To Avoid
- Planting too late in fall: Leaves won’t mature before hard frost.
- Overcrowding: Reduces air flow and increases disease risk.
- Underwatering: Leads to tough, bitter leaves.
- Ignoring soil pH: Nutrient uptake is poor outside 6.0-7.5 range.
- Not hardening off transplants: Causes transplant shock.
Avoid these pitfalls by following the timing guidelines and preparing your soil properly. Collards are forgiving plants, but they perform best with a little planning.
Extending The Season
Use cold frames, row covers, or low tunnels to protect collards from hard freezes. These structures can extend your harvest by 4-8 weeks in Maryland. In coastal areas, you might harvest fresh collards all winter with minimal protection.
For spring, start seeds indoors in late February to get a head start. Use grow lights or a sunny windowsill. Transplant after hardening off for 7-10 days.
Frequently Asked Questions
Can I Plant Collard Greens In Maryland In The Summer?
Yes, but only for a fall harvest. Plant from mid-July to early September. Summer planting for a spring harvest is not recommended because heat causes bolting.
What Is The Last Planting Date For Collard Greens In Maryland?
For fall, plant no later than early September in coastal areas and mid-August inland. This ensures at least 60 days of growth before hard frosts.
Do Collard Greens Need Full Sun In Maryland?
Collards grow best in full sun (6-8 hours daily), but they tolerate partial shade, especially in hot summers. In western Maryland, full sun is ideal for fall crops.
How Long Do Collard Greens Take To Grow In Maryland?
Most varieties mature in 60-80 days from seed. Transplants cut this to 40-50 days. Harvest outer leaves as needed, and the plant will continue producing.
Can I Grow Collard Greens In Containers In Maryland?
Yes, use a pot at least 12 inches deep and wide. Choose compact varieties like ‘Champion’ or ‘Flash.’ Ensure good drainage and water regularly, as containers dry out faster.
By following these guidelines, you can enjoy fresh, flavorful collard greens from your Maryland garden from late fall through early spring. The key is timing your planting to match your local climate and using simple season-extension techniques. Happy gardening!