Guides/Sunflower

Sunflower ‘Midnight Rouge’

Helianthus annuus

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Days to cut

75–80 days

Status

trying

Catalog ID

CF-68

Seasons logged

2

First sown

2026-05-06

Velvety burgundy petals surround deep-brown centers on branching 4–6 foot plants.

How it grows

Germination

Days to germ.
7–14 d
Soil temp
70–75 °F
Depth
0.5 in
Pre-treatment
None, but can soak seeds for up to 3 hours before sowing to speed germination.
Viability
3 yrs

Culture

Days to maturity
75–80 dThis variety
Spacing
4–24 in
Height
36–180 in
Sun
Sun
Frost
Hardy to ~32°F · to 32°F · tender
Sow indoors
No
Outdoor / direct
Yes

Harvest

Cut stage
When petals have color and just begin to lift away from center disc, but before the bloom is fully open.
Vase life
5–7 d
Handling
Store out of direct sunlight; re-cut stems every 2 days
Notes
Yield: One stem per plant. SeeDS: When petals wither and drop, back of heads turn yellow-brown, and seeds get plump, cut with 1-2 ft of stem and hang by stem to dry. After 1-2 d, rub flower face to remove dried seeds.

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
Outdoor / directMay 21 – Jun 18
Bloom (from outdoor)Jul 30 – Aug 27
See the whole season

Progress

Sown 2026-05-06
Day 188 · past expected maturity (75–80)
This sowing

Seed source

Firefly Farm & Mercantile

Other Sunflower varieties

Species overview