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Giant ironweed blooms in the later summer and early fall, adding grace to the very tip-top of the garden. If you do much driving in the country, you’ve seen the tall plants with bright purple aster-like flowers blooming along the roadsides. Plants provide an important late-season source of food for butterflies. Ironweed thrives in full sun and moist soils in zones 5-8. (Vernonia)
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).
6-8 feet tall and 3-6 feet wide, Giant Ironweed (Vernonia gigantea) can provide fall fireworks in the garden or can be pruned back in mid-summer to result in a more manageable maximum height. It’s most effective for pollinator benefit and garden color when planted in multiples of three or more plants. Site plants in full sun in moist soil. Giant ironweed can tolerate wet feet for extended periods of time. They will self-sow, so deadhead when flowers fade to keep the garden tidy. Relatively easy to grow, and not prone to pest and disease problems. Pairs well with other prairie wildflowers and grasses.
More Information
SKU
AM014841
Item Package Size
Bag of 3
Common Name
Giant Ironweed
Botanical Name
Vernonia gigantea
Zones
5, 6, 7, 8
Light Requirements
Full Sun, Half Sun / Half Shade
Flower Color
Purple
Mature Height
72-96" tall (6-8 feet)
Mature Spread
36-72' wide
Bloom Time
Summer to fall
Planting Depth
Plant so that the top of the root is 1" below the soil line.
As soon as your order is placed you will receive a confirmation email. You will receive a second email the day your order ships telling you how it has been sent. Some perennials are shipped as potted plants, some as perennial roots packed in peat. The ‘Plant Information’ section describes how that item will ship. All perennials and spring-planted bulbs are packaged to withstand shipping and are fully-guaranteed. Please open upon receipt and follow the instructions included.
Perennials and spring-planted bulbs are shipped at the proper planting time for your hardiness zone. Perennial and spring-planted bulb orders will arrive separately from seeds. If your order requires more than one shipment and all items are shipping to the same address, there is no additional shipping charge. See our shipping information page for approximate ship dates and more detailed information. If you have any questions, please call Customer Service toll-free at (877) 309-7333 or contact us by email.
Shipping Rates
Our shipping rates are calculated based on our actual average shipping costs. We do not seek to profit from shipping fees, so rest assured that our shipping rates reflect an average of what it costs to get our guaranteed products safely to your door.
US Shipping Charges
Merchandise Total
Shipping Charges
Up to $19.99
$6.99
$20 to $34.99
$8.99
$35 to $49.99
$10.99
$50 to $74.99
$12.99
$75 to $99.99
$14.99
$100 and Over
$16.99
Canadian Shipping Charges
Merchandise
Shipping Charges
Up to $24.99
$14.95
$25 to $49.99
$19.95
$50 to $74.99
$24.95
$75 to $99.99
$29.95
$100 and Over
$39.95
If your order requires more than one shipment and all items are shipping to the same address, there is no additional shipping charge. If you have any questions, please call us at (877) 309-7333.
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