POLLINATION GUIDE

APPLES & PEARS (MALUS AND PYRUS)

In order to have fruit from apple and pear trees, you need a second tree for cross-pollination. As long as the second tree is within 500 feet (150 m), pollination should occur. Within city limits, most apple and pear trees will be pollinated by insects carrying pollen from the neighbours’ trees.

If your apple or pear trees are not performing well, the following trouble-shooting list may help you to determine why:

• Cool, rainy weather conditions during flowering.

Unfortunately, other than hoping for better luck next year, there is nothing to be done.

• Old, unproductive trees that do not flower.

Generally, apple and pear trees have a productive life span of about 30 to 40 years. Trees older than this should be replaced; we do however, know of a 70-year-old apple tree that continues to produce heavily each year. Trees can be rejuvenated by removing old, unproductive growth and allowing new growth to replace it.

• A poor crop the year following a bumper crop.

Some apple varieties have a tendency to perform biennially, with a great crop one year, not much the next, and a better crop again the third year.

• No tree of the same genus (i.e. Malus) nearby.

It is best to pollinate fruit trees of the same genus with each other — apples with apples, or pears with pears — but pears can cross-pollinate with apples, as long as both trees bloom at the same time.

• The other cultivar in yard is sterile.

Some but not all ornamental crabapple trees work for cross-pollination purposes. A few varieties have sterile pollen.

• Lack of pollinating insects, such as bees.

Try adding to your flowerbeds. Most flowering plants are almost guaranteed to attract bees. The annual herb borage and the perennial beebalm (Monarda) are especially good for this purpose. Because their flowering times coincide with those of many fruit trees, marigolds, pansies, spurge, trollius, and arabis are the best choices.

• The trees are of the same variety.

Clones will not pollinate each other; for example, a Norland apple tree cannot pollinate another Norland apple tree.

APRICOTS (PRUNUS)

European apricots are self-pollinating. Only one tree is needed for fruit production. Manchurian and Siberian apricots fruit more dependably when other apricot varieties or Nanking cherries are nearby.

CHERRIES & PLUMS (PRUNUS)

• Sour cherries are self-pollinating; only one tree is needed for fruit production. Carmine Jewel, Crimson Passion, Evans, Montmorency, Northstar and Latowski fall into this category.

• Plums and cherry-plums are divided into five different groups: American Hybrids, Damson, European, Japanese and Native. The plums that we grow here fall into only 3 of these groups: American Hybrids, Japanese and Native.

In order for cross-pollination to occur, it is essential that the varieties bloom at the same time. Varieties that bloom mid-season will cross-pollinate both early and late-blooming varieties, as well as other mid-season bloomers.

Many chokecherries will also aid in cross-pollination. The closer the relationship between species, the larger and more abundant the fruit will be.

GRAPES (VITIS)

Grapes are self-pollinating. Cross-pollination is not essential, but some hybrids may have non-viable pollen. In this case, purchasing 2 or more varieties would solve the problem. Regular pruning is essential for fruit production. To do this, remove all suckers from the base of leaves after the end of June. Remove ends of canes two to three leaves past the last fruit cluster. Remove all non-producing canes.

BLUEBERRIES

Blueberries are self-pollinating, but two or more varieties will result in better yields and larger berries.

CURRANTS AND GOOSEBERRIES (RIBES)

Currants and gooseberries are self-pollinating. Excellent fruit production can be obtained with just one plant. If currants are grown near gooseberries or jostaberries however, yields can be even better!

Black currants perform better when different cultivars are grown together. Note that black currants will not cross with red or white currants; the reverse is also true.

STRAWBERRIES, RASPBERRIES AND SASKATOONS

Strawberries, raspberries and saskatoons are all self-pollinating.

 

Copyright © 2006 Jeffries Nurseries Ltd. All rights reserved.
Webmaster: Philip Ronald