Delphinium menziesii

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USDA Hardiness zone: Zn5a -15º to -20ºF

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Delphinium menziesii

Menzie’s Larkspur is one of the most widespread species west of the Cascades. That doesn’t mean it easy to grow, and as a crop it can be a pain, That said its one of the ultimate spring flowers and its lost immense amounts of its range in the Willamette Valley to development. This widespread perennial is a  grassland Delphinium that can be found in oak woodlands with Dodecatheon hendersonii, and Plectritis congesta and Romanzoffia californica. The soils that it inhabits run the gamut from sand near the beach to xeric clay in and around the Willamette Valley. This can be a tricky species to establish, my best advice is to double dig a wide area where there is very little competition from other plants. Add a small amount of all organic fertilizer to the hole. Water in well and water again once a week until June. Then you can permanently taper off. That means in subsequent years it will rely on natural rainfall alone. Upright perennial to 20″ tall multiple brilliant blue flowers often with a lighter bee. I’ve also seen them in a deep black/blue velvet purple. Sets seed and goes dormant in mid-summer. Its very very important to protect the emerging plant or seedling from snails and slugs. Bait heavily when you first see growth in late winter.  Though widespread but no longer common this Delphinium seems to adapt best to cultivation with a light gravel mulch. This protects the plant from slugs and provides a perfect medium to germinate the seeds. Very popular pollinator plant visited by all sorts of bees, fly bees, hover flies, butterflies and more. The seedlings are conspicuous and the leaves mimic the parent plant.  Full sun to light shade.  Oregon native plant.

Delphinium menziesii growing in the wild with Romanzoffia californica.

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