Oklahoma’s unpredictable weather makes September the ideal month for establishing collard plants. Knowing the best time to plant collard greens in oklahoma is crucial for a successful harvest, as the state’s hot summers and cold winters can be tough on these leafy greens.
Collards thrive in cool weather, and Oklahoma’s fall season offers the perfect window. By planting in early September, you give your collards enough time to mature before the first hard freeze. This timing also helps them avoid the extreme heat of summer, which can make leaves bitter and tough.
If you miss the fall window, don’t worry. You can also plant collards in early spring, as soon as the soil is workable. However, fall planting often yields sweeter, more tender leaves because the cooler temperatures encourage sugar production.
Best Time To Plant Collard Greens In Oklahoma
The exact timing depends on your specific location within Oklahoma. The state spans USDA hardiness zones 6a in the panhandle to 8a in the southeast. Generally, the best time to plant collard greens in Oklahoma is from late August to mid-September for a fall harvest, or from late February to early April for a spring crop.
For fall planting, aim for a date that gives your collards at least 60 to 80 days before the first expected frost. In northern Oklahoma, that means planting by early September. In southern parts, you can push it to mid-September or even late September.
Spring planting should happen as soon as the soil temperature reaches at least 45°F. In most of Oklahoma, that’s around late February or early March. If you plant too late, the heat will stress the plants and cause them to bolt, or go to seed.
Understanding Oklahoma’s Climate Zones
Oklahoma’s climate varies significantly from north to south. The panhandle experiences colder winters and shorter growing seasons, while the southeast enjoys milder winters and longer falls. This affects when you should plant.
In the panhandle (zones 6a-6b), plant collards in late August for fall. The first frost often arrives in early October. For spring, wait until mid-March to avoid late freezes.
In central Oklahoma (zones 7a-7b), including Oklahoma City, plant in early September for fall. The first frost typically comes in late October. Spring planting can start in late February or early March.
In southeastern Oklahoma (zones 8a-8b), like near Hugo, plant in mid-September for fall. Frost may not arrive until November. Spring planting can begin in early February.
Why Fall Planting Is Preferred
Fall planting is often recommended for collards in Oklahoma because the plants develop better flavor. Cool temperatures convert starches to sugars, making the leaves sweeter. Plus, fall rains help reduce the need for watering.
Collards are also more pest-resistant in the fall. Many common pests, like aphids and cabbage worms, are less active as temperatures drop. This means less work for you.
Another benefit is that collards can survive light frosts. In fact, a frost can improve their taste. If you plant in September, you can harvest well into November or even December with some protection.
Spring Planting Considerations
If you prefer a spring crop, timing is critical. Plant too early, and a late freeze can kill young seedlings. Plant too late, and the heat will cause bolting. Aim for a window when the soil is workable but the air temperature is still cool.
Start seeds indoors about 4 to 6 weeks before your last expected frost. In Oklahoma, that means starting seeds in January or February. Transplant them outdoors when the soil is workable and the danger of hard freeze has passed.
For direct sowing, wait until the soil temperature is at least 45°F. Use a soil thermometer to check. In most of Oklahoma, this happens in late February or early March. Cover plants if a late freeze is forecast.
Step-By-Step Planting Guide
Once you’ve determined the best time to plant collard greens in Oklahoma, follow these steps for a successful crop. Start with healthy soil and proper spacing.
Preparing The Soil
Collards prefer well-drained soil rich in organic matter. Test your soil pH; collards grow best in a pH of 6.0 to 6.8. Add lime if your soil is too acidic.
- Clear the area of weeds and debris
- Loosen the soil to a depth of 8 to 10 inches
- Mix in 2 to 4 inches of compost or aged manure
- Add a balanced fertilizer, like 10-10-10, according to package directions
- Rake the bed smooth
Planting Seeds Or Transplants
You can start collards from seeds or buy transplants. Seeds are cheaper but take longer. Transplants give you a head start.
- For seeds: Sow them 1/4 to 1/2 inch deep, spacing them 3 inches apart in rows 18 to 24 inches apart
- Water gently after planting
- Thin seedlings to 12 to 18 inches apart once they have 3 to 4 true leaves
- For transplants: Dig holes slightly larger than the root ball
- Place transplants at the same depth they were in the pot
- Space transplants 12 to 18 inches apart in rows 18 to 24 inches apart
- Water thoroughly after transplanting
Watering And Mulching
Collards need consistent moisture, especially during germination and early growth. Water deeply once or twice a week, providing about 1 to 1.5 inches of water per week. Use a soaker hose or drip irrigation to keep leaves dry and prevent disease.
Apply a 2 to 3 inch layer of organic mulch, like straw or shredded leaves, around the plants. Mulch helps retain moisture, suppress weeds, and keep soil cool. In fall, it also protects roots from temperature fluctuations.
Fertilizing
Collards are heavy feeders. Side-dress with a nitrogen-rich fertilizer about 3 to 4 weeks after planting. Use blood meal, fish emulsion, or a balanced granular fertilizer. Repeat every 4 to 6 weeks during the growing season.
Be careful not to over-fertilize, as this can cause excessive leaf growth and reduce flavor. Follow package instructions for application rates.
Caring For Collards Through The Season
Once your collards are established, they need regular care. Watch for pests and diseases, and harvest leaves at the right time.
Pest And Disease Management
Common pests include aphids, cabbage worms, and flea beetles. Inspect plants weekly. Remove pests by hand or use insecticidal soap. Row covers can protect young plants from insects.
- Aphids: Spray with a strong stream of water or insecticidal soap
- Cabbage worms: Handpick or use Bacillus thuringiensis (Bt)
- Flea beetles: Use diatomaceous earth or row covers
Diseases like downy mildew and black rot can occur in wet conditions. Avoid overhead watering and ensure good air circulation. Remove infected leaves immediately.
Harvesting Collards
You can start harvesting outer leaves when they are about 6 to 8 inches long. Leave the inner leaves to continue growing. Harvest from the bottom up, taking only a few leaves from each plant at a time.
For the best flavor, harvest after a light frost. The cold triggers sugar production, making leaves sweeter. In Oklahoma, this often happens in late October or November.
If you planted in spring, harvest before the weather gets hot. Once temperatures consistently exceed 80°F, leaves become bitter. Cut the entire plant at the base if needed.
Extending The Harvest
Collards can survive light freezes, but hard freezes below 25°F can damage them. To extend your harvest into winter, use protection methods.
- Cover plants with frost cloth or old blankets on cold nights
- Use a cold frame or low tunnel to trap heat
- Mulch heavily around the base to insulate roots
- Harvest all remaining leaves before a hard freeze
With protection, you can harvest collards in Oklahoma through December or even January in milder years.
Common Mistakes To Avoid
Even experienced gardeners make mistakes. Here are some common pitfalls when planting collards in Oklahoma.
- Planting too late in spring: This leads to bolting and bitter leaves
- Planting too early in fall: Heat stress can stunt growth
- Overcrowding: Collards need space for good air circulation and root development
- Inconsistent watering: Drought stress causes tough leaves; overwatering leads to disease
- Ignoring soil pH: Collards need slightly acidic to neutral soil
- Not thinning seedlings: Crowded plants produce smaller leaves
Avoid these issues by following the timing and care guidelines above. Your collards will thank you with a bountiful harvest.
Varieties For Oklahoma Gardens
Some collard varieties perform better in Oklahoma’s climate. Choose varieties that are heat-tolerant for spring planting and cold-hardy for fall.
- Georgia Southern: A classic variety, heat-tolerant and productive
- Vates: Cold-hardy and slow to bolt, great for fall
- Champion: Compact and disease-resistant, good for small spaces
- Flash: Fast-growing and heat-tolerant, ideal for spring
- Morris Heading: Produces loose heads, very cold-hardy
Try a mix of varieties to see which works best in your garden. Local nurseries often carry varieties suited to Oklahoma.
Frequently Asked Questions
Can I plant collards in Oklahoma in July?
July is too hot for collards in Oklahoma. The heat causes stress and bitter leaves. Wait until late August or September for fall planting.
How late can I plant collards in Oklahoma for fall?
You can plant as late as mid-September in southern Oklahoma and early September in northern parts. Later planting may not give enough time before frost.
Do collards need full sun in Oklahoma?
Collards grow best in full sun, but they can tolerate partial shade, especially in hot summers. Aim for at least 6 hours of direct sunlight daily.
Should I start collards indoors or direct sow?
For fall planting, direct sowing works well. For spring, starting indoors gives you a head start and avoids late freezes. Transplants are also easy to find at nurseries.
How do I protect collards from Oklahoma’s wind?
Use row covers or plant near a windbreak like a fence. Mulching also helps keep soil moist and plants stable.
Final Tips For Success
Planting collards at the right time is the most important step. But a few extra tips can make your harvest even better.
Water consistently, especially during dry spells. Oklahoma’s weather can be unpredictable, so check soil moisture regularly. Stick your finger an inch into the soil; if it feels dry, water.
Harvest leaves regularly to encourage new growth. Don’t let leaves get too large, as they become tough. Young leaves are the most tender and flavorful.
Consider planting a second crop in late summer for a continuous harvest. You can sow seeds every 2 to 3 weeks until mid-September.
Finally, enjoy your collards. They are nutritious and versatile. Use them in soups, stews, sautés, or as a side dish. With the right timing, you’ll have a steady supply from fall through early winter.
Remember, the best time to plant collard greens in Oklahoma is September for fall and late February for spring. Stick to these windows, and you’ll be rewarded with a bountiful harvest of sweet, tender leaves.