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 You are here    Flowers by the Sea / Everything Else / Tweedia caerulea
Tweedia caerulea will be available to ship on Apr 13, 2020.  Just in time for your spring planting
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Tweedia caerulea

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Price: $12.50

(Blue Milkweed) It's not unusual to see the sky-blue, star-shaped flowers of Tweedia caerulea tucked into bridal bouquets. Yet they are members of the humble milkweed family Asclepiadaceae.

Qty:
Common name
This is the non-scientific name used for a plant. A plant may have several common names, depending on the gardener's location. To further confuse the matter, a common name may be shared by several completely different plants. At Flowers by the Sea, we rely on the scientific name to identify our plants and avoid confusion.
Blue Milkweed
USDA Zones
The U.S. Department of Agriculture plant hardiness zones indicate the temperature zones where a plant is likely to thrive. It is determined by the average annual winter minimum temperature. Actual winter temperatures may be higher or lower than the average.
8 - 11
Size (h/w/fh)
The anticipated mature size of the plant: Height, Width & Flower Height.
36"/24"/36"
Exposure
This is the average amount of sunlight that a plant needs to thrive. Generally, full sun exposure is 6 or more hours of direct sun daily while partial shade is less than 4 hours of sun or dappled shade all day. Plants may tolerate more sunlight in cooler climates and need afternoon shade in extremely hot climates.
Full sun
Soil type
This is the kind of soil that a plant needs to thrive. Most plants require a well-drained soil that allows the water to soak into the soil without becoming soggy. Sandy and clay soils can be improved by digging in compost to improve drainage.
Well drained
Water needs
Plants have specific water requirements. Water loving means the plant needs regular watering to keep the soil moist. Average generally indicates applying 1 inch of water per week, or watering when the soil is dry to a depth of 3 to 4 inches. One inch of water is equal to 5 gallons per square yard of soil surface.
Average
Container plant?
"Yes" indicates that this plant can be successfully grown as a container plant.
Yes
Mature height
The mature height of this plant in average conditions.
2 to 3 feet
Mature spread
The mature width of this plant in average conditions.
1 to 2 feet
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  • Tweedia caerulea
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(Blue Milkweed) It's not unusual to see the sky-blue, star-shaped flowers of Tweedia caerulea tucked into bridal bouquets. Yet they are members of the humble milkweed family Asclepiadaceae.

Blue Milkweed is a heat-loving species that grows best in a location with full sun and access to a bit of shade. It is native to Uruguay and Southern Brazil and can be planted as a perennial in USDA Cold Hardiness Zones with moderate winter weather. However, it works well as an annual in other zones. You can encourage branching by pinching the flower buds back when growth is young.

Other common names for Blue Milkweed include Southern Star, Star of the Argentine, Silkpods and Star Flower. Another scientific synonym is Oxypetalum coeruleum. Sometimes its petals have lovely purple speckles.

This milkweed is widely grown in New Zealand to provide nectar and host caterpillars for Monarch butterflies.

Caerulea is Latin for blue. In contrast, the genus name honors James Tweedie (1775-1862), the Scottish gardener and plant explorer who found the species in South America during the first half of the 19th century. At the age of 50, Tweedie immigrated to South America and traveled throughout the continent collecting plants to send back to Scotland. He is best known for introducing wild petunias to Europe, which became wildly popular hybrids worldwide.