Oxypetalum caeruleum (Blue Tweedia) [12 Seeds]

(1 customer review)


Germination Information: Surface-sow (or just barely cover) the seeds indoors under lights in warm conditions in early to mid-spring. Soaking the seeds in water overnight before sowing, and using a heat mat to keep the growing medium toasty warm, can help to encourage good germination. Sprouting times can vary widely: usually anywhere from around 2 weeks to 3 months. The last time I grew blue tweedia from seed (2021), I sowed indoors on a heat mat on March 10 and germination began with one seedling on March 19, with more appearing randomly over the following month. Your experience may vary.

Note that this information will not appear on the seed packet you receive.

Please read the description as well before ordering.

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When it comes to blue flowers, blue tweedia (Oxypetalum caeruleum or Tweedia caerulea) is in a class by itself. Grown an annual, it generally reaches about 2 feet tall, with somewhat sprawling stems that carry fuzzy, slender leaves and sprays of five-petaled, summer blooms in an amazing shade of sky blue. The flowers of this milkweed relative are followed by slender pods that split to release silky-tufted seeds. If you don’t intend to collect seeds, I suggest removing the developing seedpods to encourage rebloom. Best in full sun. Perennial in Zones 8 to 10 (where it can scramble up several feet higher with support), but you can grow it as an annual anywhere. Or, treat it like a tender perennial and bring the plant indoors for the winter to get many more flowers and earlier bloom the following year.

Collected in August 2022. At least 12 seeds.

Please read the germination information as well before ordering.

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1 review for Oxypetalum caeruleum (Blue Tweedia) [12 Seeds]

  1. William Larson (verified owner)

    Great germination rate with these under lights and on a heat mat sown in late Spring — they are a bit slower to emerge but seedlings came up about two weeks after sowing. A neat plant! The leaves are quite charming.

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