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Re: Gibberellic acid

your solution is omly 100ppm which is quite dilute for all but some
sensitive things like Campanula and Penstemon, and may well have
degraded in storage as well. We buy GA3 in powdered form and mix fresh
solution as needed. We do not try to store it more than a week or two. I
have no idea how long it actually remains stable but it does degrade
with storage. For general use soak seed in 500-1000ppm solution until
they swell, usually a day or two. Then sow them out as usual generally
warm for most species. You can also soak a filter paper with this
solution and place larger seeds on this and put the whole thing in a
ziploc bag, pick off the seedlings as the roots emerge. For very fine
seed sow and grit seed as ysyal and mist them with a spray bottle with
ga3. this is a little bit tricky sometimes to get the concentrations
right, Remember too much leads to very strechy seedlings that are hard
to grow on. They will outgrow this if you can keep them alive long
enough but a physoplexus comosum with a pair of cotyledons atop a 6"
hairfine stem is beyond my ability to grow on. As a commercial nursery
we use it only for certain things but for those it is wonderful. You may
need to try several different concentrations till you get it just right.
you may wish to check out our original article in the NARGS bulliten
which is responsible for starting the whole thing as well as Norm Deno's
book. He presents a lot of ga3 data but we think our method is best if
you actually want to grow plants using it. Trust us we do this for a
living.

Bob Stewart - Arrowhead Alpines
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