Tennessee’s climate allows for two planting windows, one in early spring and another in late summer. Knowing the best time to plant collard greens in tennessee can mean the difference between a bountiful harvest and a disappointing patch of leaves. Collards thrive in cool weather, so timing your planting to avoid extreme heat is key for success.
This guide walks you through exactly when to sow seeds or set out transplants. You’ll learn how to work with Tennessee’s varied growing zones, from the mountains to the Mississippi River. Let’s get your collard patch started right.
Best Time To Plant Collard Greens In Tennessee
The ideal planting times for collards in Tennessee fall into two distinct seasons. For a spring harvest, plant 3 to 4 weeks before the last expected frost. For a fall harvest, plant 6 to 8 weeks before the first expected frost.
Collards are frost-tolerant and actually taste sweeter after a light frost. This makes them perfect for Tennessee’s unpredictable spring and fall transitions. The key is to avoid the hot, humid summer months when collards become tough and bitter.
Spring Planting Window
In most of Tennessee, the last spring frost occurs between mid-March and mid-April. For eastern parts of the state, like Knoxville or the Cumberland Plateau, this date leans toward mid-April. For western areas, like Memphis, it can be as early as late March.
Here is a simple timeline for spring planting:
- West Tennessee (Memphis, Jackson): Plant seeds or transplants from March 1 to March 20.
- Middle Tennessee (Nashville, Clarksville): Plant from March 15 to April 1.
- East Tennessee (Knoxville, Chattanooga): Plant from March 25 to April 10.
You can start seeds indoors 4 to 6 weeks before these dates. This gives your plants a head start. Just harden them off before moving them outside.
Fall Planting Window
Fall is actually the prefered season for many Tennessee gardeners. Collards grown in autumn often have superior flavor. The first fall frost typically arrives between mid-October and early November across the state.
Count backward 6 to 8 weeks from your local first frost date. This gives your collards enough time to mature before cold weather sets in.
- West Tennessee: Plant from August 15 to September 1.
- Middle Tennessee: Plant from August 10 to August 25.
- East Tennessee: Plant from August 1 to August 20.
Fall planting avoids the worst of summer heat. Your collards will grow steadily through September and October. They can handle light frosts well into November.
Understanding Tennessee’s Growing Zones
Tennessee spans USDA hardiness zones 6a through 8a. This affects your exact planting dates. Zone 6a (higher elevations in the east) has a shorter growing season. Zone 8a (far west) has a longer one.
Check your specific zone online using your zip code. Adjust your planting dates by about one week per zone difference. Zone 7b (much of middle Tennessee) is the average.
How To Plant Collard Greens Step By Step
Once you know your window, follow these steps for a strong start. Collards are not fussy, but they do need consistent care.
Choose The Right Variety
Some collard varieties handle heat better than others. For spring planting, choose a bolt-resistant type. For fall, any standard variety works well.
- Georgia Southern: Classic, heat-tolerant, good for both seasons.
- Vates: Compact, cold-hardy, perfect for fall.
- Champion: Slow to bolt, tender leaves.
- Flash: Fast-maturing, great for late spring.
Prepare The Soil
Collards need rich, well-draining soil with a pH between 6.0 and 7.5. Test your soil if possible. Add compost or aged manure a week before planting.
Work the soil to a depth of 8 to 10 inches. Remove rocks and debris. Rake the bed smooth. Collards are heavy feeders, so good soil prep matters.
Sow Seeds Or Transplants
You have two options: direct sow seeds or set out transplants. Seeds are cheaper and offer more variety. Transplants give you a faster harvest.
For seeds, plant ¼ to ½ inch deep. Space seeds 3 inches apart in rows 18 to 24 inches apart. Thin seedlings to 12 to 18 inches apart once they have two sets of true leaves.
For transplants, dig a hole slightly larger than the root ball. Place the plant at the same depth it was in the pot. Space transplants 12 to 18 inches apart. Water well after planting.
Water And Mulch
Collards need about 1 to 1.5 inches of water per week. Water deeply once or twice a week, not lightly every day. Consistent moisture prevents bitter leaves.
Apply a 2-inch layer of organic mulch around the plants. Straw, shredded leaves, or grass clippings work well. Mulch keeps soil cool, retains moisture, and suppresses weeds.
Caring For Your Collard Plants
Collards are relatively low-maintenance. A little attention goes a long way toward a great harvest.
Fertilizing
Side-dress collards with a nitrogen-rich fertilizer about 3 weeks after planting. Use blood meal, fish emulsion, or a balanced 10-10-10 granular fertilizer. Repeat every 4 to 6 weeks during the growing season.
Too much nitrogen can make leaves soft and prone to pests. Follow package directions carefully. Organic options are gentler on the soil.
Pest Control
Common collard pests include cabbage worms, aphids, and flea beetles. Check the undersides of leaves regularly. Handpick caterpillars or use insecticidal soap for aphids.
Row covers are excellent for protecting young plants. They block pests while letting light and water through. Remove covers when plants start to flower.
Harvesting
You can start harvesting outer leaves when they are about 8 to 10 inches long. Leave the inner rosette to keep growing. This method gives you multiple harvests from one plant.
For a full harvest, cut the entire plant at the base when it reaches 12 to 18 inches tall. This works well for fall crops before a hard freeze. Collards store well in the refrigerator for up to two weeks.
Common Mistakes To Avoid
Even experienced gardeners make errors with collards. Here are the most common ones to watch for.
- Planting too late in spring: Collards bolt (flower) in hot weather. Plant early enough to harvest before summer heat.
- Planting too early in fall: Heat stress stunts young plants. Wait until late August or September.
- Overcrowding: Thin seedlings properly. Crowded collards produce small, tough leaves.
- Skipping mulch: Bare soil heats up fast and dries out. Mulch is essential for cool-season crops.
- Ignoring soil pH: Collards need neutral to slightly acidic soil. Test and amend if needed.
Seasonal Adjustments For Tennessee
Tennessee’s weather can be unpredictable. A late frost or early heat wave can throw off your plans. Stay flexible and watch the forecast.
Dealing With Late Frosts
If a hard freeze threatens your spring transplants, cover them with row covers or old sheets. Remove covers during the day if temperatures rise above freezing. Collards can survive brief dips to 20°F, but prolonged cold damages them.
Managing Summer Heat
If you plant in late spring, provide shade during the hottest part of the day. Use shade cloth or plant collards on the east side of taller crops like corn or tomatoes. Water consistently to reduce stress.
Extending The Fall Season
Collards can survive into December with protection. Build a simple cold frame or use heavy row covers. They will keep producing even after light snow. The flavor improves with each frost.
Frequently Asked Questions
Can I plant collard greens in Tennessee in July?
July is too hot for direct sowing. You can start seeds indoors in late July for an August transplant, but it is risky. Wait until August for best results.
How late can I plant collard greens in Tennessee?
For fall, you can plant as late as early September in most areas. For spring, plant no later than early April in middle Tennessee. Check your local frost dates.
Do collard greens need full sun in Tennessee?
Collards grow best in full sun (6 to 8 hours daily). In hot summer areas, partial afternoon shade can help prevent bolting. Morning sun is ideal.
What is the best fertilizer for collard greens in Tennessee?
A balanced 10-10-10 fertilizer works well. Organic options like compost tea or fish emulsion are also effective. Apply every 4 to 6 weeks during growth.
Can I grow collard greens in containers in Tennessee?
Yes, use a container at least 12 inches deep and wide. Choose a compact variety like Vates. Ensure good drainage and water more frequently than in-ground plants.
Final Tips For Success
Collards are one of the easiest greens to grow in Tennessee. They reward you with months of harvests if you time them right. Stick to the two-window system: early spring and late summer.
Keep a garden journal with your planting dates and weather notes. This helps you refine your timing each year. Share your harvest with neighbors—collards freeze well for winter soups.
Remember, the best time to plant collard greens in tennessee is when the soil is cool but not frozen. Spring and fall are your windows. With a little planning, you will have fresh collards from your garden for most of the year.
Start preparing your soil now. Check your zone. Mark your calendar. Your collard patch is waiting.