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House Plants/Question about cacti


Hello Will
I would thank you for this website and all help that you gave to us , my question is about cacti like mammillaria and others
I have variety of cactus and they have flowers when I purchased them from nursery
I have them more than a year. Until now no flowers appears
and I don't know how to stimulate them to bloom again
they all grow nicely and I have no problem with them except blooming
I put them on windowsill (east facing) and I water them once a month in winter and once every ten days in summer .What can I do?
thank you very much

Hi Sara,

Thank you for your kind words. It is my pleasure to help folks like you with your indoor plant issues.

The key to getting most Cacti to flower is the rest period that usually occurs for several months in the late fall and early winter. During this semi-dormant period, Cacti need almost no water, no fertilizer, lots of sunlight and temperatures between 35 and 50 degrees F. These are the conditions that Cacti are adapted to in their native habitats. Unfortunately, it is very hard to duplicate those conditions indoors, especially the 2-3 month period of cool temperatures.

If possible, move your Cacti outside in the fall so that they can experience the cool temps that they require. Leave them outside as long as temps are above freezing, but be sure not to expose them to frost. The longer the period of cool temps in the fall, the more flowers you will get the following spring and summer. However, sometimes even a short period of cool temps will be enough to produce some flowers.

In any case, reduce watering during this rest period. Sometimes misting the Cactus is sufficient. Do watch for signs of any shriveling that may indicate that your Cactus has gotten too dry and the soil should be watered. Lots of direct sunlight is a requirement all year long, so keep yours on the sunniest windowsill you have.

Finally, repotting or disturbing the roots in any way is likely to discourage flowering. Cacti almost never need repotting, anyway.

Please let me know if any of this is unclear or if you have any additional questions.

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Will Creed


I am the only expert in this category with professional hands-on experience and knowledge of all indoor plants. I can answer questions regarding light, water, fertilizer, repotting, pruning and humidity and temperature requirements. I can identify plant pests and provide information on safe, effective treatments. My answers are based on 35 years of professional experience and scientific research and are clear and easy to understand. I do NOT use search engines to find answers to your questions. If you read my previous posts here, you will get a good idea as to how thorough and professional my answers are.


I have over 35 years of professional indoor landscaping experience caring for plants in homes, offices, building lobbies, stores, restaurants, and other adverse environments. I have written extensively on the care of indoor plants, including a 260 page book. My specialties include Ficus trees, low light plants, repotting, pest control, and re-blooming holiday plants. Be sure to check my ratings and nominations to learn why I am the top-rated indoor plant expert. I am the only House Plant expert consistently ranked in the AllExperts Top 20.

BA, Amherst College

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