Ask the
Green Thumb
A gardening expert digs into and answers your homegrown questions.
By Ann Wied
Brookfield, Wisconsin
Cactus Pointers
I need tips on growing indoor cactus. Are any particular fertilizers needed?
—Helen Bressler,
Belle Plaine, Minnesota
A. For cactus to thrive indoors, pay close attention to the light, soil, water and fertilization requirements of your specific plants. For optimal light, consider not just direction, but also intensity and duration. Soil promotes root health and provides support, so use a mix that’s roughly half potting soil and half drainage material (like perlite and coarse sand).
Some varieties are winter growers, so be sure to follow recommendations for your specific cactus. Water regularly during the growing season and lightly during dormancy. Fertilize only when your plant is actively growing, and use houseplant fertilizer at half- or quarter-strength. High-phosphorous fertilizers promote flowering and healthy roots. Don’t overfertilize with nitrogen.
Ann Wied, our guest garden expert, is the Consumer Horticulture Educator for the UW-Extension in Waukesha County, Wisconsin. She teaches gardeners of all ages through workshops, hands-on gardening programs and presentations. Ann has a bachelor’s degree in horticulture and agriculture journalism.
Photo: Paula Cartwright (Headshot)
FREE Garden Club Newsletter
Delivered monthly, our Garden Club Newsletter brings you simple ideas for the most colorful gardens...seasonal to-dos...easy-care plant recommendations...budget-minded tips and secrets...plus humorous backyard blunders to brighten your day! As the Garden
Club grows, there'll also be special features and offers available only to Garden Club members. Sign up now!