First photo: Bottom piece at bottom; middle piece above.
Second photo: I planted the whole bottom piece, without disturbing its old, dry sphagnum, using the PET method. The other pieces I set on the surface and loosely covered the roots with dry potting soil. The potting soil is quite shallow over the LECA. I'm using EpiWeb for the bottom layer.
Third photo: Top piece.
I have not watered them yet. I'm thinking maybe I should, even though they don't have many roots. The roots they have are about 3" long. I have other seedling Catasetinae that are just beginning to push roots. I don't know whether other people are also experiencing late root growth.
Oh, the cacti - on the left is Maihueniopsis darwinii and on the right is Tephrocactus molinensis, the Ann Schien super clone.
Quote:
Originally Posted by 3rdMaestro
Something like this would only work if it was new growth, is that correct?
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I don't know. I think I was lucky to break it as it was making new growth. The shoot formation hormones were circulating through the plant. The upper broken pieces were cut off from the one new shoot on the bottom piece, so their meristems were removed from growth inhibiting hormones that many plants form when they begin growing a new shoot. That led to each piece forming a new shoot quickly. Most Catasetinae can form new growths during the summer, well after the first set are initiated; I don't know whether breaking off the top of a pseudobulb during the summer would lead to breaking a new growth. I don't have any big old plants, so I won't be trying that for a while - but I will try it eventually.
The wax was also very important. I'm almost certain all three pieces would have dried out through the wounds and died before they rooted.