Oryzalin is a much less toxic alternative to colchicine for inducing polyploidy in plants (including cacti).
Using appropriate safety this chemical can be easily used by the home plant breeder to induce polyploidy.
Its also used as a pre-emergent herbicide, but I bought it to induce polyploidy.
Ive got 10mL bottles of 40.4% Oryzalin in propylene glycol, $5+ postage.
With the concentrations required 10mL of this solution will last for ever.
For more information see:
* I disagree with his calculations.
And the attached paper.