Small vegetables–many leaf crops and even compact and miniature varieties of fruiting crops such as tomatoes and peppers–can be grown indoors in a sunny, bright windowsill year round.
Vegetable gardening indoors has most of the same requirements as an outdoor garden: bright light, water, nutrients, and protection from pests and diseases. Since space is likely to be more limited growing crops indoors, choosing quick-maturing crops planted in quick succession is your best strategy; for example, sow a few seeds of leaf lettuce each week and harvest leaves often while they are still young and tender…
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http://www.harvesttotable.com/2010/01/windowsill_gardening_growing_v/