Wisteria takes much longer
to reach maturity than most garden plants, and the biggest
problem with this is they won't flower until they're mature.
Unfortunately, that can take three to 10 years or longer,
especially if the plant was started from seed rather than
from a graft or cutting. If your plant is young, there are
a few tricks you can try to speed up the process.
You should prune Wisteria twice a year, once right after
flowering and again in autumn after the plant stops growing.
And give it a good rejuvenation pruning every third year,
cutting the most vigorous stems back to 3 inches from the
vine.
Keep in mind that Wisteria requires full sun (six or more
hours of direct sunlight a day) and consistently moist soil.
It should never be fertilized with nitrogen. Phosphorous,
indicated by the middle number in the ratio on a fertilizer
package, encourages blooming, so using a triple super phosphate
product should help you get some flowers. The Cornell Cooperative
Extension recommends applying a 0-60-0 product in the fall.
Since you've missed your window of opportunity this year,
you can apply 3 to 5 pounds of 0-20-0 per 100 square feet
in early spring instead.
When you do start to see flowers, deadhead them immediately
after blooming in order to force energy into more flower
bud production instead of seed production.
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