How to Grow Salad Greens in Garden Beds
Sow the Seeds
Plant both head and leaf lettuces in shallow rows, but head lettuce should be sown much more thinly. Once seeds have germinated, thin them out to 6–12 inches apart, depending on their final size.
Protect your plants from slugs, using mini cloches made from clear plastic bottles. You may also need to net them to keep birds from eating your crops. Water them regularly during summer. They are prone to bolting in hot weather, so plant them close to taller crops, such as beans, that will provide shade.
Leafy Options: Planting and Aftercare
Arugula (image 1) is best sown in spring and early fall, when the cooler temperatures make it less likely to bolt. Sow thinly and protect the young seedlings from flea beetles, which nibble the leaves, by covering the plants with a fine mesh or garden fleece.
Lamb's lettuce (image 2) can be sown at any time in spring and summer. It's a useful crop to sow late in the season to provide a tasty winter substitute for lettuce. For the best quality leaves, grow lamb's lettuce under cloches, in a greenhouse or under well-vented plastic (keep out of direct sun).
Green Onions: Growing and Harvesting
Green onions are an ideal crop for garden beds and for pots and containers. Sprinkle a small amount of seed on the surface of the soil once every two weeks throughout spring and summer, to ensure a constant supply. In mild areas, green onions sown in late summer can be left in the soil during winter, to harvest the following spring.
Simply lift the tangy bulbs from the soil as you need them and use in salads or stir-fries.