ga3

[Véronique Macrelle]

Is ga3 not recommended for particular species, genus ?


 and on the contrary for which species is it particularly effective?

I want to organize a Ga3 workshop for people who seed, and who are not too much far from me.
 I used it at home the last year on of numerous kinds, without its being always one sucked from the first spring. On the contrary, I saw germination from better on Clematis, for instance.

[Hannelore]

Hallo Véronique,

just a tip for your workshop:

After my experience one of the most common mistakes in using ga3 is the use of the wrong dissolvent. Ga3 is not soluble in water, so it is solved first in some drops of alcohol and the mixture then filled up with destilled water. But using pure alcohol (ethanol) from the pharmacie is a must. Denatured alcohol (alcool à brûler) contains substances that destroy the effect of ga3 by altering its chemical structure or killing the embryos during the germinating process.

BW
Hannelore

[Véronique Macrelle]

thank you for this precision

[Alan_b]

I had to look up GA3.  For the chemists amongst us it is: (3S,3aS,4S,4aS,7S,9aR,9bR,12S)-7,12-Dihydroxy-3-methyl-6-methylene-2-oxoperhydro-4a,7-methano-9b,3-propenoazuleno[1,2-b]furan-4-carboxylic acid.  For those who prefer shorter names it is Gibberellic acid. 

Here is a link to the Wikipedia entry: https://en.wikipedia.org/wiki/Gibberellic_acid thence a link to why you might want to use it for seed germination: http://www.crfg.org/tidbits/gibberellic.html 

[Véronique Macrelle]

can alcohol modified at 70 ° in pharmacies be suitable?


this workshop will be done at home in France in Nord Pas de Calais or Haut de France. I can invite a few other people who would like to process their seeds: It will be on February 8 at 2 p.m.

 contact me by messaging.

[Hannelore]

Hallo Véronique,

if the 70° Alkohol is suitable - I don't know it. But as the preparation of this solution is made with pure water, it may do as well as 98°. Today I'll start with some vegetables: Tomatoes, peppers, chillis and physalis - only those with a long cultivation period. By chance I have only Alcohol 70° here and I'm too lazy to drive to a pharmacie again, so I'll try that. I'll report what happens.

Best wishes
Hannelore

[Véronique Macrelle]

and you use ga3 for tomato or pepper seeds?

I was wondering if we can also use ga3 to force bulbils to start. I have already noticed that there is always a percentage of bulbils (gladiolus, Arisaema, Lilium or Dicentra which refuse to start)

 I even noticed that bulbs of Lilium sargentiae fallen near the big parent bulb start while those planted in a separate pot remain dormant, so it is certainly a question of hormone.

[Véronique Macrelle]

the method for soaking the seeds that I'm going to use is the one with coffee pots paper, described in image here
https://plantes-passion.forumactif.fr/t1507-utilisation-de-lacide-gibberellique-ga3
it allows me to process fifty or more species at once.
 and for my guests, they will easily take their seeds during treatment to sow them the next day at their home.