Hello Peter;

I have a question on what to do about my Euphorbia trigona – it had been ill about 2 years ago and was treated with Neem and then brought into the house and recovered nicely. It kept growing taller and taller and never branched. It finally threw two branches this summer and grew another foot taller…it is now 40 inches tall! It is still completely upright with a chop stick secured to the bottom 6 inches, planted in a 6” deep terra cotta and happy. Should I just let it continue to get taller and taller? OR should I cut it down to size and let the potted bottom half alone – will it sprout branches? Then I would re-pot the top half?

Is it a must to use a rooting solution? I did not use any kind of rooting solution when I put the top of the cleistocactus that rotted off (of course, I did remove all rot and then let the bottom dry for awhile) into some cactus soil. It seems happy and has started growing a new fluff of top furry hair J. Will it root without rooting solution?

Thanks for your time, once again, to help me figure all this out.

~Karen

Karen,
It’s just about too late in the year to take Euphorbia cuttings, so if you do want to cut it and re-root, I recommend waiting until next year and taking the cuts between May and August. We do ours on July 1. The Euphorbia cuts are easy to get to root without hormones so long as they are well callused over.

The pot its in is too small, so it would be happier in a larger pot. Probably a 10-12″ pot.

And finally, these Euphorbias can be grown much slower with much less water. It’s amazing how long you can go between waterings. I recommend about once per month to really slow down its growth, although if its in a sunny hot window it may need a little water every 2-3 weeks.

With regular water, these will top 8ft. pretty quickly. We’re often asked to come into people’s homes to cut them down before they hit the ceiling.
Peter