Are clementines self fertile or self sterile if they are sterile would i need two plants for pollination or is there a different way to get them to set fruit.

Clementines are not self compatible, therefore require another compatible citrus variety, or pollination by gibberellic acid. Clementines have low fruit yield when cross pollination and seed set is prevented. They will produce greater yields when cross pollination occurs. Self-incompatibility is a genetically controlled process specific to certain mandarin varieties such as Clementine. Pollination within and between flowers of another Clementine, or other self-incompatible varieties will not produce fruit. However, if Clementines are grown near others varieties that can cross-pollinate them, then fruit will be set in large quantities, but will be very seedy. Gibberellic acid is often required in the absence of cross-pollination to increase fruit set in these cases. I "pollinate" my three Clementine varieties with a Gibberellic acid spray, and obtain a nice crop, the fruit are still seedless as no pollen was used. - Millet

Where can you buy gibberellic acid, on the internet or do nurseries have it?

Oh and how do you spray the acid right onto the flowers or just a gentle mist around the whole tree?

Millet,

Do you know if spraying gibberellic acid also works for other types of citrus that require polinators (such as tangelos)?

Pelham

Yes it does.

http://edis.ifas.ufl.edu/CH076

And another from Alabama gardening.

Quote:

Tangerine Hybrids Tangelos are tangerine-grapefruit hybrids that produce loose-skinned, tangerinelike fruits. The Orlando variety is an ideal selection for homeowner use. It is cold hardy and produces excellent quality fruits that ripen early (October to December). Dancy, Clementine, or some other variety should be planted with Orlando for cross-pollination. If a second variety is not planted with Orlando tangelo, fruiting can be enhanced by scoring the trunk with a knife (cut through bark to wood but do not remove any bark) or spraying the tree with 10 to 20 parts per million (ppm) of gibberellic acid during flowering. Other early season (October to November) tangerine hybrids that could be grown include Lee, Robinson, Osecola, Nova, and Page. These will not cross-pollinate each other. All of these hybrids (except Lee), require cross-pollination for best fruiting. Lee does not require cross-pollination as earlier reported but may not be cold hardy enough for Alabama. Fruiting these cross-incompatible varieties can be a problem.

Commercially in Florida, GA is often used for 'Orlando' tangelo. It also works on 'Minneola' but is NEVER used on that variety (in Florida) because it results in big, green warty, hideously ugly fruit. So we always naturally cross-pollinate 'Minneola'.

Where do you or where can you buy gibberellic acid?

http://www.biosynth.com/index.asp?topic_id=164&g=&m=&kn=G-2700&intro=yes

http://cgi.ebay.com/GIBBERELLIC-ACID-3-Plant-Hormone-and-Growth-Regulator_W0QQitemZ190022577538QQihZ009QQcategoryZ20546QQssPageNameZWDVWQQrdZ1QQcmdZViewItem

Dr. Manners, the effect of GA on Minneola must be environmentally driven and pecular to Florida. I use it on my greenhouse Minneolas (2) and my resulting fruit are just fine. I purchase my GA from American Clay Works, Denver CO. 303-534-4044 or 1-800-873-2297. A person should be able to find GA at any supplier to the grape industry, or the floral industry, or the citrus industry. - Millet

I was reading up on the acid and was wondering what ratio you use millet for the spray.

10 to 20 parts per million (PPM)...