Growing a fruit or vegetable garden takes experience and a combination of the right conditions. Some colder regions, such as Pennsylvania, restrict gardeners' chances in regard to plants and fruits that can withstand the cold. Certain fruit plants, though, relish the cold snaps and thrive in these areas.
Pennsylvania blackberries, also known as Leafy-Flowered Blackberries, are a specific variety that thrive in Pennsylvania's cooler growing conditions. These shrubs grow 2 to 5 feet high. The plants lose all foliage in the fall after producing their fruit and die back to root stock, then sprout back up in spring.
Pennsylvania blackberries are similar to other blackberry varieties, according to Illinois Wildflowers. They need full to partial sun, rich, loose soil and adequate moisture throughout the growing season.
Pennsylvania covers growing zones 5 and 6 with hot, steamy summers and winters with temperatures frequently below freezing. In Pennsylvania, wild Pennsylvania blackberries grow side by side with domestic cultivators in the forest, on farms and in gardens.
Gardeners in Pennsylvania who are starting new blackberry plants should start seeds or seedlings in autumn to give the plants the cold stratification they need. Starting seedlings before the first frost in Pennsylvania, which comes as early as September, lets them root and establish before winter. Blackberries that start this early have a better chance of blooming and fruiting in their first spring season.
In Pennsylvania, blackberries stick to their standard growing season and ripen in mid- to late summer. Early Pennsylvania blackberries ripen in July, while the harvest may continue into late August.