Whirlybird Mahogany

Family: Tropaeolaceae Flower / Herb

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.

Light: Full SunMaturity: 50 DaysHabit: Bush

Botanical illustration of Whirlybird Mahogany

Planting schedules and alerts are optimized for Columbus (Zone 6b).

Crop Dates

Milestone	Date
Start Indoors	Direct Sow
Last Frost	Apr 25th
Transplant / Sow Outdoors	Apr 25th
Harvest Begins	Jun 14th
Harvest Ends	Oct 16th

Crop Details

Trait	Value
Days to Maturity	50
Sun Requirements	Full Sun
Growth Habit	Bush
Support Needed	None
Planting Depth	Normal
Germination Temp (°F)	70
Min Soil Temp (°F)	40
Min Night Temp (°F)	35
Harden Off (days)	Not Required

Culinary Notes

Chef's Note

These mahogany nasturtium blooms taste like pepper and limey tang in a soft, juicy package—built for topping rather than cooking down. Their color holds up best in fresh, last-minute finishes where that hot-bright bite stays electric on the palate.

Best Uses

snip fresh blooms and leaves over mixed greens for a pop of hot-tang heat
use as a garnish on tacos, roast chicken, and fatty fish—serve cold so it stays crisp
toss through potato salad or grain bowls right before serving to keep the bite lively
pack into quick pickles or a fast vinegar brine where the peppery tang can bloom

Flavor Profile

peppery, watercress-like bite bright tangy snap tender, juicy petals and leaves slightly espresso-dark floral warmth

Kitchen Pairings

lemon olive oil goat cheese radishes grilled chicken salmon

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.

How can I tell when Whirlybird Mahogany (Tropaeolum majus) is ready to harvest?

Harvest for blooms about 45–55 days after sowing, when plants are actively flowering (fresh flowers form continuously as long as you keep harvesting). For seed harvest, wait until the seed pods swell and turn from green to pale tan, then collect them before they fully dry and scatter. Snip flowers in the morning for best quality and keep removing blooms to encourage more production.