You'd probably best forget watermelons indoors... even the ones that produce small fruits still grow on huge, running vines and they require insects for pollination.

Strawberries are 'day neutral', so no need to fiddle with the light schedule. If you chose a running variety remember to remove the runners to push the plant back to producing flowers and fruit.

Most cultivars these days have 'hermie' flowers, so you shouldn't need insects to support pollination to get a fruit set. If the cultivar is a poor pollinator, you'll find a lot of small, hard, misshapen berries. Then it is time to pull out the paint brush and help things along.

Tomatoes, lettuce and chillies are also easy indoor growers.

sara.