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Wisteria growing on pergola needs to be pruned by half

Don Kinzler of NDSU Extension-Cass County advises that spring is the ideal time to prune wisteria planted three years ago, thinning stems to reduce bulk by about half and encourage vigorous new growth.
Wisteria vines tend to grow back onto themselves, creating dense tangles on pergolas; gardeners can use twine or wire to coax stems over the top and prevent this self-folding behavior.
Kinzler recommends potting packaged rhubarb roots from a chain store if growth has already begun, keeping them under plant lights until planting time to protect against freezing temperatures.
Planting heat-loving squash, pumpkin, and melons outdoors too early risks frost damage and permanent stunting; Memorial Day serves as an appropriate benchmark for Northern gardeners to begin outdoor planting.
Research from North Dakota State University identifies a 10-day window for optimal planting, with melons especially benefiting from early indoor seeding to ensure successful harvest compared to direct garden seeding.

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