7 CFR § 201.30c – Noxious-weed seeds of vegetable seed in containers of more than 1 pound.
Except for those kinds of noxious-weed seeds shown in § 201.16(b), the names of kinds of noxious-weed seeds and the rate of occurrence of each shall be expressed in the label in accordance with, and the rate shall not exceed the rate permitted by, the law and regulations of the State into which the seed is offered for transportation or is transported. If in the course of such transportation, or thereafter, the seed is diverted to another State of destination, the person or persons responsible for such diversion shall cause the seed to be relabeled with respect to noxious-weed seed content, if necessary, to conform to the laws and regulations of the State into which the seed is diverted.
Butterfly Weed Seeds (Asclepias)
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:
Asclepias (Milkweed) are sun loving plants that are essential perennials for monarch butterflies providing food for caterpillars and nectar for adult butterflies. They bloom from mid-summer into early fall and, with their milky sap, are resistant to rabbits and deer.
Asclepias can be divided into two groups for plant care; Asclepias tuberosa with orange (sometimes yellow) flowers and all the other species with pink (sometimes white) flowers.
Planting Milkweed Seeds:
Milkweed (Asclepias) seeds germinate best under warm soil conditions. The seeds need a cold, dormant period, known as stratification, to germinate.
They can be successfully seeded outdoors in fall in areas that received frost, for spring germination. For mid to late spring planting, all species (A. tuberosa, A. syriaca, A. sullivantii, A. incarnata) will also germinate moderately well when seeded into warm ground after being stratified (chilled).
Dry stratification is done by placing dry seed in the refrigerator for 30 or more days. A more effective strategy is to moist stratify them by mixing seed with moist (not soggy) sand in a zip-lock plastic bag and place them in the refrigerator for 30 days. After 30 days of cold moist storage, the seed’s natural chemical germination inhibitors have dissipated and are ready to sprout.
Asclepias tuberosa (Orange Butterfly Weed) – this perennial stays dormant until later in the spring than many other plants, especially when grown in pots. It’s fine to plant dormant plants; don’t up-pot them for planting later in the growing season.
Preferred growing conditions:
- Need sandy or gravelly soils (except the Clay form which does well in heavier soils including dry clay.)
- Does best with gravel mulches.
- After their second growing season, only requires deep but infrequent watering. Plant in full hot sun.
- Just a few handfuls of compost and Yum Yum Mix added to the planting hole is enough. Don’t plant into a rich, highly-amended soil.
- When planting dormant plants, water thoroughly after planting and wait to water again until the plant comes into active growth, at which time a deep watering every week or so is adequate. Take care not to overwater young transplants.
- Asclepias has a long, carrot-like tap root that should remain undisturbed after planting and should NOT ever be divided.
Preferred growing conditions:
- These species grow in a wide range of soil types, including clay.
- They don’t need mulching (except in very hot climates).
- These are moisture-loving perennials and do well in wet to moderately moist soil conditions.
- Plant in full to part sun areas.
- They like compost enriched soils at planting time.
- Asclepias syriaca and A. speciosa will spread to make big patches of plants and are best planted in parts of the landscape where they won’t crowd out less vigorous plants. Not recommended for the prime spots in your perennial beds.
- Asclepias incarnata (Swamp Milkweed) is a more refined grower and is fine to include in perennial beds.
Oftentimes, Milkweeds won’t grow much their first season in the ground, so be patient. They are establishing their root system and crown. By the second growing season, the plants will begin to get bigger and look more robust. Asclepias species are an odd bunch and don’t behave like many other more familiar perennials. So be patient and accept their quirky nature.
- Fertilize Asclepias just once in fall with Yum Yum Mix and Planters II. – Naturalized plantings don’t need additional fertilization.
- To encourage re-seeding and provide winter interest with their ornamental seed pods, leave the stems intact over the winter. In mid-spring, remove old stems just above ground level.
- All species of Asclepias are late to emerge in the spring, so don’t be concerned if other perennials come up first and they remain dormant.
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. Depending upon your order date, we may hold your shipment to combine it with other products on your order, if applicable. 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 (800) 925-9387 or contact us by email.
View Shipping Rate Chart
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
|Up to $4.99||$9.99|
|$5 to $299.99||$9.99 + 8% Merchandise Total|
|$300 and Over||11% Merchandise Total|
Canadian 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|
We charge one low flat rate for shipping our products even if your order requires multiple shipments. If you have any questions, please call us at (800) 925-9387.