Barrel cactus also scientifically known as Echinocactus grusonii, makes a great interior plant for your balcony.
Light: Full sun. Barrel cactus do best in a very sunny window, perhaps a southern exposure. Plants that do not get enough sunlight will grow more slowly and fail to thrive.
Water: Water infrequently and ensure that the soil drains completely. Do not leave any water sitting in the tray or allow them to sit in water. They are very prone to root rot.
Fertilizer: If necessary, feed with a weak liquid cactus fertilizer throughout the growing season.
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