I recently purchased what seemed to be a healthy looking Christmas cactus and it was I have read most of what I can find on this site for info. I noticed to day that some upopened buds are falling off. Any suggestions on what may be causing this or what I may be doing wrong? It sits in a window away from any heat sources (except the sun) and I only water it 10-12 days. I have not given it any fertilizer.

Thanks for any suggestions!

If the buds that are dropping are small and not well developed, then that is because the light has changed. Even a subtle change caused by something as simple as repositioning it relative to the light can cause undeveloped buds to drop.

If large, developed buds are dropping, then it could be caused by temps that are too warm or soil that has gotten too dry or kept too wet. Repotting will also cause this.

They do go through some shock due to the transfer from a warm enviroment to a cold enviroment back to a warm enviroment. and the different light, temp and hummidity levels in your house compared to the store.

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GreenCeed