Because the components usually contained weed seeds and disease organisms, recipes abounded for sterilizing the mixture in the oven or microwave. Prior to today’s soilless potting mixes, houseplant growers blended their own, usually using one-third each of garden soil, sand and an organic component such as peat or manure. The very finest outdoor garden soil quickly becomes hard-packed, easily water-logged and oxygen-starved when restricted to the confines of a houseplant pot. The term “potting soil,” though, is a misnomer because there’s really no soil in the mixes used for houseplants anymore. The right potting soil makes the difference between a struggling plant and a healthy, thriving plant. And of course, any successful houseplant is only as good as the soil in which it’s growing. Houseplant Facebook groups have large followings with members sharing stories and success tips. Houseplants are currently the hottest topic in the world of gardening.
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