Garden soil is for sale most months of the year, even in my cold area, but I tend to repot a lot of plants and start cuttings or seeds so I make my own soil. You do need a certain mix for your indoor plants and indoor gardens. When you use garden soil indoors it tends to turn hard. Houseplants can’t thrive in cement-like soil. They need sufficient drainage and aeration. Tough soil will also tends to stunt the plants roots. Houseplants also...