SproutSmart
SproutSmart™ Intelligent Garden Sowing

Sonata White

Cosmos
Zone 10b Save Garden

Planting Schedule

Add Sonata White to your garden to build a schedule and get reminders.
Botanical illustration of Sonata White
60d to harvest

Feathery, cloudlike blooms rise on slender stems in a luminous wash of pure white—cool, crisp, and quietly radiant in the garden. Sonata White opens with delicate, paper-thin petals around a softly glowing center, holding their shape beautifully for display and long-lasting bouquets. Grow it for airy movement and effortless elegance: a drought-tolerant cosmos that brings instant bloom power to borders and cutting gardens alike.

Crop Dates

Growing note: In frost-free Zone 10b, grow this cool-season crop during the cooler dry season (October–February).
MilestoneDate
Start Indoors—
ClimateFrost-Free Climate
Transplant / Sow OutdoorsOct 1st
Harvest BeginsNov 30th
Harvest EndsFeb 28th

Crop Details

TraitValue
Days to Maturity60
Sun RequirementsFull SunFull sun
Growth HabitUpright
Support NeededNone
Planting DepthNormal
Germination Temp (°F)75
Min Soil Temp (°F)60
Min Night Temp (°F)50
Harden Off (days)Not Required

Today's Conditions

Outdoor planting for Sonata White in Zone 10b typically begins around 2026-10-01. Wait until soil reaches at least 60°F before transplanting Sonata White.

Garden Alerts

In frost-free Zone 10b, grow this cool-season crop during the cooler dry season (October–February).

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Frequently Asked Questions

What pest or disease most often affects Cosmos bipinnatus (Sonata White), and what’s the best control at home?
Cosmos bipinnatus commonly gets powdery mildew when nights are cool and humidity stays high, especially with dense foliage. Improve airflow by spacing plants farther and watering at the soil line; remove heavily affected leaves early. If it’s spreading, spray with an at-home horticultural option labeled for powdery mildew and repeat as directed until new growth stays clean.
How often should I water Cosmos bipinnatus during its main growing phase, and what soil moisture level should I aim for?
During active growth (after seedlings establish and before flowering peaks), water deeply about 1–2 times per week so the top few inches dry slightly between waterings. Cosmos bipinnatus tolerates short dry spells, but consistent moisture prevents stressed, leggy growth—avoid soggy soil because it encourages mildew. A simple check: if the top 1–2 inches of soil are dry, water until moisture reaches the root zone.
Botanical illustration of Sonata White

Feathery, cloudlike blooms rise on slender stems in a luminous wash of pure white—cool, crisp, and quietly radiant in the garden. Sonata White opens with delicate, paper-thin petals around a softly glowing center, holding their shape beautifully for display and long-lasting bouquets. Grow it for airy movement and effortless elegance: a drought-tolerant cosmos that brings instant bloom power to borders and cutting gardens alike.

Today's Conditions

Outdoor planting for Sonata White in Zone 10b typically begins around 2026-10-01. Wait until soil reaches at least 60°F before transplanting Sonata White.

Garden Alerts

In frost-free Zone 10b, grow this cool-season crop during the cooler dry season (October–February).

Sowing Tips

Soil Temperature

Direct sow or transplant when soil at planting depth holds 60°F for reliable germination and early growth.

Expert Note

Sow cosmos where they’ll get full sun, and avoid transplant shock by direct-sowing or using biodegradable pots if you must start indoors.