Gro 'n Sell

Tweedia Japanese Varieties (half trays)

$50.00
Tray Size: 50 (half tray)
variety: Pint White Double MIx (50 cell half tray)

Finally! We have Tweedia! And not *just* the traditional variety that goes by the name ‘Heavenly Blue’. You’ll notice Heavenly Blue is the cheapest selection (lowest price per plug), as it has been around the longest and is not quite as refined as the other three varieties we are offering. It is still a beautiful star-shaped blue flower, so if this is your first go with Tweedia don’t shy away from this variety. 

For those of you looking for a little more oomph, try Tweedia ‘Pure Blue’ - not only does it have the purest blue color, it also has a rounder, more desirable flower shape. To me the flowers resemble the shape of Cynoglossum flowers. Stems of ‘Pure Blue’ will be stronger and taller, but all Tweedia benefit from a layer or two of support netting to keep the stems as straight as possible. 

Both ‘Blue Double Mix’ and ‘Pint White Double Mix’ will have an even mix of single, semi-double and fully-double flowers. All forms are gorgeous! The first flowering stems of all Tweedia varieties will be short, but subsequent stems will continue to elongate. Keep the plants deadheaded and cut unused stems all the way down to the base of the plant. 

Tweedia are in the milkweed family and will emit a milky sap when cut. We suggest you harvest in the coolest part of the day and let your cut stems hydrate in the cooler overnight before you need them. If you are having a hard time with wilting stems, a heat treatment to the cut end of the stem will often seal off the sap and help with hydration.

We don't have exact hardiness data, but they are winter hardy in some locations, even locations that freeze. We welcome your feedback.

 

 

About Tray Sizes

210 and 125 cell trays are full-sized trays, and three of these will fit in a shipping box.

50 cell trays are half-sized trays (unless otherwise noted) and two of these are the equivelent of one full sized tray. Six of these will fit in a shipping box.

18 and 32 cell trays are full sized trays specifically for our vernalized perennials. These have their own set of shipping rules (find details HERE) and cannot be combined with items grown in 210, 125, or 50 cell trays.

Growing Guides

Click here to access all of our comprehensive growing guides.


Common Name Tweedia, Blue Milkweed 
Genus  Oxypetalum
Species Oxypetalum coeruleum (formerly Tweedia caerulea)
Family Apocynaceae
Life Cycle  Tender perennial, typically grown as an annual in cooler climates.
Format Plugs
Plug Care Plant plugs soon after arrival. Maintain consistent moisture but avoid waterlogging. Do not allow to become stressed or rootbound before planting out. 
Netting / Staking Netting is not required but plants do have a sprawling habit and will tangle. A layer of netting will help keep stems upright and may help keep them less tangled at time of harvest. 
Temperature Range Prefers temperatures between 65-75°F. Sensitive to frost; hardy in USDA Zones 8 to 10.
Spacing Space plants anywhere from 6 to 12 inches apart to accommodate their growth habit.
Soil Preference Thrives in well-drained soil with moderate fertility. Tolerates a range of soil types but prefers slightly acidic to neutral pH.
Day Length Day-neutral plant; daylength does not affect flowering. Full sun to partial shade; at least 6 hours of direct sunlight daily.
Pinching Pinch active growth tip when plugs have reached 4-5 inches in height to encourage bushier growth and more blooms.
When to Plant Plant outdoors after the danger of frost has passed in the spring.
Harvesting Harvest stems when the first flowers are fully open and some buds remain closed for optimal vase life. Tweedia are in the milkweed family and exude a thick, milky sap when cut which can irrigate sensitive skin. 
Post Harvest Care Place cut stems in clean water immediately. Use of floral preservatives can extend vase life. Some growers struggle with wilting stems after harvest and use a hot water treatment (placing cut stems in a couple inches of hot - not boiling - water after harvest) or treatment with a flame to help with hydration/conditioning. Some trials might be required to see what post-harvest care works best for you. Once conditioned, stems can last over a week in the vase. 
Diseases / Insects Generally pest-resistant. Monitor for aphids and spider mites. Ensure good air circulation to prevent fungal issues. Leaves are slightly velvety which help with a certain degree of natural defense. 
Bailey's Notes Tweedia thrives in the field, but if you can spare space in your hoophouse, you'll be rewarded with taller stems and superior-quality blooms. In the field, rain may cause pink or purple discoloration on the delicate blue flowers. We offer several varieties, including a striking white and a captivating double form. Keep in mind, the double variety may include plants with single or semi-double flowers - but all are undeniably beautiful.
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