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Colchicine

Colchicine (COAL - cha - seen) is a powerful mutagen used initially for gout and now...

FROM WIKIPEDIA: 

Since chromosome segregation is driven by microtubules, colchicine is also used for inducing polyploidy in plant cells during cellular division by inhibiting chromosome segregation during meiosis; half the resulting gametes, therefore, contain no chromosomes, while the other half contains double the usual number of chromosomes (i.e., diploid instead of haploid, as gametes usually are), and lead to embryos with double the usual number of chromosomes (i.e., tetraploid (4N) instead of diploid (2N). While this would be fatal in most higher animal cells, in plant cells it is not only usually well tolerated, but also frequently results in larger, hardier, faster-growing, and in general more desirable plants than the normally diploid parents.

So this means the plants that survive the Colchicine wash in the lab have already made it through the process and are on their way to greatness.

Not every plant is a tetraploid (4N), but most that come through the process have the best chance for success they can get.  I throw out any plants that look "puny" just 'cause...

Now for some reality --  the only way for you to get a plant with obvious "ploidy" without spending a lot of money is to buy flasks.  The reason is - when I take them out of flask or get them from the lab - I can tell which ones have "the look" and price them accordingly.  In the future, I will have 2 kinds of plants for sale.  Plants with obvious ploidy will be $25 (or more) in a 2 inch pot and the others will be $6-12.  The less expensive might grow up but the others have shown promise from the very beginning.  The whole reason for the expense of Colchicine is to get these "special" ones so they are very valuable.  The flowers are larger, richer colored and last longer.  The plants are more vigorous and often seem practically indestructible.  Just saying...