Growing Lettuce in South Australia
Lettuce is versatile and incredibly easy to grow. It’s a great first vegetable for kids because it grows quickly, especially if you pick a few leaves every day rather than waiting for a full head. There are so many varieties out there, as well as varieties specific to just about any climate, meaning that lettuce can basically be grown anywhere, anytime. Generally, loose leaf varieties prefer warmer weather and heading lettuces do best in cool weather. Most heading varieties will bolt to seed in the warmer months.
Not giving your lettuce enough water can result in bitter tasting leaves as well as early flowering.
Lettuce needs some shade in warm areas like Southern Australia. A spot that gets sun in the morning, but is protected from the worst of the afternoon sun is ideal. Consider planting your lettuces at the base of some peas or corn for dappled shade
Good drainage is essential. Two weeks before planting, add lots of compost and some poultry manure, and water with a seaweed feed. Lettuce thrives at a soil pH of around 6, so add lime if necessary.
Check your seed packet for specific varieties. Generally, loose leaf varieties prefer warmer weather and heading lettuces do best in cool weather. Most heading varieties will bolt to seed in the warmer months.
Sprinkle the seed, then cover lightly with potting mix. Sow every 3 weeks for a continuous harvest.
Generally, loose leaf varieties prefer warmer weather and heading lettuces do best in cool weather. Most heading varieties will bolt to seed in the warmer months.
Space your plants around 20 – 25cm and water in your with some half strength seaweed feed. Lettuce can be grown successfully from seedlings, but its usually best to sow lettuce seeds directly as the process of transplanting seedlings can delay maturing up to 3 weeks. Plant every 3 weeks for a continuous supply.
Remove damaged leaves from the plants regularly. Plants use a lot of energy and resources to keep those damaged leaves growing. Rather remove them quickly so that your plants can put all their energy into healthy leaves.
Water frequently and keep the soil moist, especially during the hot, dry summer months. Remember that plants in pots will need to be watered more often. Keeping the moisture level even will avoid tip burn, which is when the tips of the leaves go brown and die. Water at night to minimise the loss of minerals, especially calcium. Trickle or drip irrigation are great, but make sure you water seedlings sufficiently while they are establishing.
Over-fertilising contributes to snail infestations, so stay away from commercial preparations and feed no more than fortnightly with manure or worm castings.
Mulch with dried grass clippings or lucerne straw, or try some rough compost around the plants, which will also deter slugs. Make sure that the mulch and the lettuce do not make contact.
Time to harvest will depend on the variety, so check your seed packet, but you should have full heads between nine and twelve weeks. Harvest in the morning, especially on hot summer days. Most lettuces can be “cut and come again”, so pick a few leaves as needed rather than taking the whole head. This will really extend your harvest.
Snails and slugs
These guys love lettuce. Lay down grit, like eggshells or silica sand or create barriers around your plants. Remove any slugs or snails that you see.
Being leafy, lettuces are vulnerable to these hungry critters. If you see the eggs or caterpillars appear on the plants, remove them by hand. Spraying with soap spray will also be helpful.
What to do about Snails and slugs?
What to do about Caterpillars?