Fall veggies produce their best flavor and quality when they grow during cooler temperatures. Planning a successful fall vegetable garden requires thoughtful planning.
Radishes mature quickly and are very hardy. Plant them three to six weeks before the average frost, 1/2 inch deep and i inch apart. They need six eight hours of sunlight and it's best to water them deeply but less frequently. They're ready to harvest when the roots are approximately i inch around.
Lettuce is considered a carefree crop compared to others. Plant head lettuce 8 inches apart and 1/2 inch deep. You'll need a well-drained bed that gets about six hours of sunlight per day. Give it 1 inch of water when the top inch of soil feels dry or about every five to 10 days. Harvest once the heads are fully formed and firm.
Leaf lettuce needs six to eight hours of direct sunlight a day and prefers cool soil. Plant the seeds 1/4 inch deep and space 6 to 8 inches apart. It also needs frequent light watering but be careful not to over water. Harvest lettuce leaves as soon as they are big enough to eat.
Kale is a member of the cabbage family and easy to grow. It needs full sunlight and a soil temperature between 40 and 70 degrees F. Plant the seeds about 1/2 inch deep and space them 12 to 15 inches apart. The soil should remain evenly moist but give the top layer time to dry between watering. Kale is usually ready for harvest 70 to 95 days after planting.
Onions can be grown from seeds but it's much easier to start them from sets, or mini-bulbs that have been started commercially and then dried to postpone growth. Onion sets are best planted in the fall in mild-winter regions. You don't want to plant onions entirely under the soil as they need room to grow. So plant them about 1 inch deep and 3 to 5 inches apart. They only need 1 inch of water per week. They also need 12 to 14 hours of sunlight per day. Onions are ready to pull when their tops have fallen over.
For a fall harvest, start seedlings indoors six to eight weeks before the last average frost. When the seedlings grow 4 inches tall, transplant them in your garden 5 inches apart. Kohlrabi needs at least six hours of sunlight per day and moist, well-drained soil. Give 1 to 1/2 inches of water per week if it doesn't rain. Harvest kohlrabi stems when they are young and tender and about 3 inches in diameter.