Didiscus (Blue Lace Flower) in Zone 5a & 5b

Trachymene coerulea

When to plant didiscus (blue lace flower) in zone 5b

Zones 5a and 5b share the same average frost dates in our data, so this page covers both.

Method: Direct sow: Direct-sow outside. Didiscus (Blue Lace Flower) doesn't transplant well, or doesn't need the extra time indoors.

Start indoors	Not typically started indoors
Direct sow / transplant outside	May 10–May 17
Estimated bloom	Aug 8–Aug 15 (~90 days after direct-sowing)

Spacing: 2 per square foot (square-foot-gardening spacing). Mature height: 2-3 ft.

Didiscus, also called blue lace flower, is a sweet-scented cut flower that pairs stiff, sturdy stems with a delicate, lacy flower head, an unusual combination that makes it a favorite for bouquets.

How didiscus (blue lace flower) fits zone 5's season

Zone 5b's frost-free window runs about 148 days, from May 10 to October 5. Didiscus (Blue Lace Flower) needs about 90 days from sowing to first harvest.

Good companions

No standout companions recorded yet for Didiscus (Blue Lace Flower).

Where to buy didiscus seeds

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See it growing

Search YouTube for "growing didiscus (blue lace flower)" videos → (a live search, not a hand-picked video; results vary and aren't vetted by us)

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Growing Didiscus (Blue Lace Flower) in USDA zone 5b: when to start seeds indoors, when to direct-sow, and when to expect a bloom.

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