Indoor Garden Seeds . Once you know your last average frost date, you can simply count back the weeks recommended for growing your specific plant. Herbs are mostly grasses, and they thrive indoors, can be harvested often, and don’t take up a lot of space. The 6 Best Indoor Garden Kits And Systems Of 2021 from www.nbcnews.com Lettuces, arugula, spinach, kale, and other leafy greens are also easy to grow indoors, though you’ll have more luck harvesting them as baby greens, rather than trying to grow them to maturity. Another option is to purchase a long tray that can fit in a windowsill. Indoor garden seed collection calikim smart pots vivid color 1 gallon containers 3 pack.