Crown Of Thorns - Knowledgebase Question

Mahanoy, PA
Question by tobes
September 13, 1999
My crown of thorns was beautiful until we put central air in this summer. Now it has no leaves left on it. Will they come back. The plant itself is healthy just no leaves. I grew this from a cutting five years ago and I hate to see it like this now. It is so big and I would like to keep it but not without leaves because it doesn't look nice that way.


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Answer from NGA
September 13, 1999

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Crown of Thorns (Euphorbia milli) is an excellent houseplant for a sunny windowsill. It has a natural period of dormancy, and leaves may drop at this time, but new leaf buds will appear in a month or two. Provide your plant with average household warmth (minimum 55F in winter), and as much light as possible, but shade from direct summer sun. Water moderately from spring to autumn, and sparingly in winter, allowing the soil surface to dry between waterings.

The central air shouldn't affect your plant, unless it is in a direct draft from one of the airducts. I expect that the leaf drop has more to do with its natural dormancy than with the new air conditioning. If you don't want to look at your bare plant, store it in another room until it develops new foliage, then bring it back into view.

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