If it’s been 7 days and you still don’t have any sprouts, it’s likely that your setup is too cold. You could see seedlings in as little as 4 days (though 5 days is more typical). Kale Indoor Growing: Week 1-2 – Check for Sprouts It’s best to grow kale indoors on a window except on windows that get really hot (like bay windows). Where you plant them can have some effect on the temperature – lower positions on a growing rack, ceramic planters, and hydroponics with air bubblers tend to run cooler. Kale is known as a “cool weather crop.” If it senses warming temperatures it will “bolt” – send up flowers and become bitter in the process. Kale Indoor Growing: Extend your harvest by keeping the Temperatures Cool In order for them to get enough light, we recommend setting up a timer to leave it on for 10+ hours per day. Kale plants are what’s known as “day-neutral” so can grow under a range of daylight lengths. How many hours per day do your Kale plants need under a grow light? This will give your PPFD (the standard measure of brightness) of 500 μmol/m²/s. In order to provide an equivalent amount with a grow light, it needs to be pretty bright! The 24W Sansi bulb should be placed 6 inches away from the top of the plant. Kale plants need the equivalent of 5+ hours of direct sunlight to grow their best. We’ve also got a buying guide for screw in types, but to keep things simple in this guide, we’ll just provide directions for the 24W Screw in Bulb by Sansi, which we think is a good middle of the road option. For an introduction to grow lights, head over to our post on grow lights for indoor gardeners. Even with a bright window, it’s unlikely that you’ll have enough natural light in the winter so we recommend a grow light for anyone who wants a constant supply of flavorful produce. Sunlight is excellent for plant growth (and free!) and you might be lucky enough to have a spot that’s got the 5+ hours of direct sun they need. Like all edible plants, Kale plants need lots of light to grow and develop good flavor.
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