2. Brighten up their day
To grow up healthy, you’ll need to ensure that your tomato seedlings are getting enough direct light. Days are much shorter during the winter, so putting your seedlings near a sunny window might not be enough to get them their daily quota of sunlight.
Unless you grow your tomatoes in a greenhouse, the best bet would be to get some artificial lighting that will help your crops grow during the winter. Leave the artificial lighting on for around 14 to 18 hours each day.
If you want to ensure that your tomato crops grow in a stocky rather than spindly fashion, keep the younger plants around two inches away from the artificial lighting. You’ll need to raise your lights as your seedlings grow taller.
Once it comes time to plant your seedlings outside, try to pick an especially sunny part of your garden to leave them in. You can do this by heading to your lawn at midday and seeing which parts shine brightest.