Ideally you want a spot that can provide at least six hours of sunlight a day at a temperature of 50˚F to 60˚F. You want to find a sunny windowsill in the home, for example a south-facing window will provide the best light levels for lettuce growing indoors. Start harvesting lettuce as soon as the leaves are big enough to eat.When judging when to water plants, be vigilant and keep the soil moist but not waterlogged.Place the container on a windowsill with plenty of light, preferably south-facing.Sow your chosen lettuce seeds thinly on the surface, or plant your lettuces around six inches apart.Fill the container with a high-quality potting mix, do not reuse garden soil in pots.Choose a container with good drainage holes in the bottom.If you want to grow lettuce from seed or simply plant lettuce, here are six simple steps to follow: You can either buy small lettuce plants from a garden store to plant up into containers, or lettuces are simple to grow from seed and you can sow the crop directly into the pot. You need only a few simple pieces of equipment to get you going and then a small amount of maintenance to keep the plants watered and looked after. If you are wondering whether it's hard to grow lettuce on a windowsill, then rest assured as the answer is it is very simple. (Image credit: Getty/Oksana Chaun) How to grow lettuce indoors in 6 steps

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