Reusing potting soil (was Trading weeds)
Diana Chapman (Thu, 07 Feb 2013 11:37:50 PST)

I have to chip in here, and I am not going to defend my favorite genus.
I don't care if some people hate Oxalis.

I NEVER reuse potting soil. I think it is totally crazy!! You are
risking your collection. You could spread fungal diseases, root
mealybugs and possibly virus among your precious collection in addition
to seeds and bulbils that you don't want. Not to mention also that used
potting soil is lacking in nutrients and probably has salt buildup from
fertilizer application. It just isn't worth the price of a bag of
potting soil. I generate mountains of used potting soil, and it goes on
my flower garden (which is large), and yes, I have little bulbs popping
up here and there, but I have never had Oxalis in my garden, mostly
native bulbs, gladiolus and tropaeolum (which was a surprise). I repot
everything about every two years, and it is a constant ongoing task
throughout the year. I have hundreds upon hundreds of pots of bulbs,
and all the old potting soil is discarded, and the pots and benches
washed along with the repotting. If I can do it with a whole nursery
full of bulbs in pots, you can too!!! I have NO problems with disease
spreading in my greenhouses or with unwanted bulbs popping up.

Diana
Telos Rare Bulbs