Guides/Cosmos

Cosmos ‘Rubenza’

Cosmos bipinnatus

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Color

Dark Red

Days to cut

60–90 days

Status

trying

Catalog ID

CF-24

Seasons logged

1

Ruby-red single flowers mature to dusky rose around burnished-gold centers on compact plants.

How it grows

Germination

Days to germ.
7–21 d
Soil temp
68–75 °F
Depth
0.125 in
Light for germ
light

Culture

Days to maturity
60–90 dThis variety
Spacing
4–12 in
Height
36–60 in
Sun
Sun
Frost
Tender; foliage will die back with first autumn frost · tender

Harvest

Cut stage
Petals just opening, but not yet flattened.
Vase life
5–7 d
Notes
Deadheading is required to have blooms all summer.

Trials

Other Observations

Notes not filed against a sowing. Everything else sits with its trial above.

No loose observations — every note belongs to a sowing.

This variety’s year

JanFebMarAprMayJunJulAugSepOctNovDec
Sow indoorsApr 2 – Apr 23
Outdoor / directMay 21 – Jun 18
Bloom (from indoor)May 21 – Jun 14
Bloom (from outdoor)Aug 2 – Sep 18
See the whole season

Seed source

Gurney's Seed & Nursery Co.

Other Cosmos varieties

Species overview