I have problems keeping the tips of my Hechtia looking good too. Other than cold damage, do you have problems from them drying out and burning during the summer? This year I think I am going to put them in saucers and see if I can keep them more moist.
And I love that Crypt. warasii. I haven't grown many Crypts. Does that one take a little more sun than the more colorful (and more tender looking) ones?
-andy
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