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Whirlybird Mahogany

Nasturtium
Zone 11a Save Garden

Planting Schedule

Add Whirlybird Mahogany to your garden to build a schedule and get reminders.
Botanical illustration of Whirlybird Mahogany
50d to harvest

Velvety mahogany blooms swirl with a beguiling, warm intensity, as if the garden has been brushed with espresso-dark pigment. Whirlybird Mahogany nasturtium forms a trailing cascade of rounded leaves and richly colored flowers with a peppery, tangy bite and a tender, juicy texture that shines in fresh arrangements and vibrant garnishes. Grow it for its showy, ornamental splash—an easy, fast performer that matures in about 50 days and rewards with continuous color.

Crop Dates

Growing note: In frost-free Zone 11a, grow this cool-season crop during the cooler dry season (October–February).
MilestoneDate
Start Indoors—
ClimateFrost-Free Climate
Transplant / Sow OutdoorsOct 1st
Harvest BeginsNov 20th
Harvest EndsFeb 28th

Crop Details

TraitValue
Days to Maturity50
Sun RequirementsFull SunFull sun
Growth HabitBush
Support NeededNone
Planting DepthNormal
Germination Temp (°F)70
Min Soil Temp (°F)40
Min Night Temp (°F)35
Harden Off (days)Not Required

Today's Conditions

Outdoor planting for Whirlybird Mahogany in Zone 11a typically begins around 2026-10-01. Wait until soil reaches at least 40°F before transplanting Whirlybird Mahogany.

Garden Alerts

In frost-free Zone 11a, grow this cool-season crop during the cooler dry season (October–February).

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Frequently Asked Questions

What pest or disease commonly affects Tropaeolum majus (Whirlybird Mahogany), and how can I treat it?
Nasturtiums like Tropaeolum majus are commonly bothered by aphids and can also get powdery mildew in humid, crowded conditions. Spray aphids off with a strong jet of water or use insecticidal soap, and improve airflow by spacing plants and removing any heavily mildewed leaves. If powdery mildew appears, repeat a labeled mildew spray as needed and avoid overhead watering to keep foliage dry.
How often should I water Tropaeolum majus during its main growing phase?
During active growth, water deeply only when the top 1 inch of soil feels dry, since Tropaeolum majus prefers evenly moist but not soggy soil. In full sun, this is often about 2–3 times per week, but reduce frequency after flowering begins if the soil stays moist. Keep the soil from staying waterlogged—wet roots can trigger leaf yellowing and fungal issues.
Botanical illustration of Whirlybird Mahogany

Velvety mahogany blooms swirl with a beguiling, warm intensity, as if the garden has been brushed with espresso-dark pigment. Whirlybird Mahogany nasturtium forms a trailing cascade of rounded leaves and richly colored flowers with a peppery, tangy bite and a tender, juicy texture that shines in fresh arrangements and vibrant garnishes. Grow it for its showy, ornamental splash—an easy, fast performer that matures in about 50 days and rewards with continuous color.

Today's Conditions

Outdoor planting for Whirlybird Mahogany in Zone 11a typically begins around 2026-10-01. Wait until soil reaches at least 40°F before transplanting Whirlybird Mahogany.

Garden Alerts

In frost-free Zone 11a, 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 40°F for reliable germination and early growth.

Expert Note

For the most vibrant mahogany blooms and compact form, plant in full sun and avoid excess nitrogen (too much feed encourages leaf growth over flowers).