Allium senescens Blue Twister
Corkscrew Ornamental Onion
Details12" tall x 10" wide (seed & division propagated). A High Country Gardens selection of Allium senescens, this cultivar was selected from a large group of seed-grown plants for its noticeably brighter, blue-green foliage. In the garden, 'Blue Twister' is very attractive with its distinctive corkscrew leaves and summer-long display of lavender-pink flowers (deadheading keeps the new flowers coming). Plant in among groundcovers that have gray foliage Cerastium, Marrubium, and Woolly Thyme are all good choices. An easy-to-grow plant in any garden soil.
|Common Name||Corkscrew Ornamental Onion|
|Botanical Name||Allium senescens Blue Twister|
|Zones||3, 4, 5, 6, 7, 8|
|Light Requirements||Full Sun, Morning Sun & Afternoon Shade|
|Mature Height||12" tall|
|Mature Spread||10" wide|
|Ships As||Potted Plant|
|Planting Time||Spring / Summer|
|Soil Type||Clay Soil, Sandy Soil, Average Soil|
|Soil Moisture||Drought Resistant / Waterwise|
|Amount of Rain||10 to 20", 20 to 30", 30 to 40" (with care)|
|Advantages||Deer Resistant, Attract Butterflies, Bee Friendly, Rabbit Resistant, Extended Bloom Time (more than 4 weeks), Low Maintenance|
|Special Groups||High Country Gardens Exclusive|
|Ideal Region||Suitable Above 7000 ft, Hot Desert, Coastal California, Northeast, Southeast, Midwest, Southwest, West, Pacific Northwest|
|Neonicotinoid-Free||Yes - Learn More|
|Ships to Hawaii, Alaska & Canada||No|
Planting and Growing Allium (Ornamental Onion) Plants
Allium (Ornamental Onion) is a large genus of culinary and ornamental plants with deep green folliage and excellent deer and rabbit resistance.
- Bulb types are late spring/early summer bloomers that go summer dormant.
- Late summer/early fall bloomers (like 'Millennium') are not bulbous and grow actively over the spring and summer months.
- Plant in most any type of soil including clay, with full to part sun. Mulch with common mulch materials, such as bark, pine needles or gravel.
- Allium prefers dry to moderate soil moisture once established.
- Cut bulb-types to ground level when foliage begins to turn yellow in summer. Cut non-bulb types to the ground in fall.
- Fertilize lightly in fall with Yum Yum Mix/compost blend.
View more Planting Guides, or download our complete Planting Guide for tips on caring for your plants when you receive your order, as well as planting instructions for Perennials, Spring-Planted Bulbs, Fall-Planted Bulbs, Cacti & Succulents, Xeric Plants and more.
Plant Shipping: Buy now and we will ship your order at the ideal planting time for your region. Spring-Planted Perennial and Bulb orders will ship from February 27-June 30, warmest zones first. Most plant orders will arrive within 3-4 days, or less, of leaving our greenhouses. This prompt delivery is provided without additional express charges.
Grass Plugs Will ship at planting time in spring 2017, beginning in late February.
Wildflower Seed & Grass Seed Orders ship within 2-3 days.
Standard shipping costs are $4.99 and up, depending on the size of the order.
Make Fast Even Faster: For ‘Rush’ same week delivery, please call customer service at 800-925-9387.
Q & A
Suggested Companion Plants:
USDA Hardiness Planting Zones
To determine if a plant is sufficiently cold hardy, the USDA created numbered zones indicating winter low temperatures; the lower the zone number the colder the winter.
- If the coldest winter temperature expected in your area is -15°F (zone 5) then any plants rated zones 3-5 will survive the winter temperatures in your area.
- If you live in very warm winter areas (zones 9-11) plants with zones 3-4 ratings are not recommended. The lack of freezing winter temperatures do not provide a time for winter dormancy (rest).
Find Your Planting Zone:
Enter your Zip Code to find your USDA Planting Zone