PlantFiles is getting a new look! Just in time for spring, we're rolling out a new look for the best online plants database. It will also work with your smart phones and mobile devices, so now you can take it with you on garden center visits or botanical garden tours. Questions or comments? Please post them here.

Mashua, Perennial Nasturtium
Tropaeolum tuberosum

Family: Tropaeolaceae
Genus: Tropaeolum (tro-PEE-oh-lum) (Info)
Species: tuberosum (too-ber-OH-sum) (Info)


Vines and Climbers


10-12 ft. (3-3.6 m)


Unknown - Tell us


USDA Zone 8a: to -12.2 C (10 F)

USDA Zone 8b: to -9.4 C (15 F)

USDA Zone 9a: to -6.6 C (20 F)

USDA Zone 9b: to -3.8 C (25 F)

USDA Zone 10a: to -1.1 C (30 F)

USDA Zone 10b: to 1.7 C (35 F)

Sun Exposure:

Full Sun



Bloom Color:


Bloom Time:

Mid Summer

Late Summer/Early Fall


Grown for foliage



Other details:

Requires consistently moist soil; do not let dry out between waterings

Soil pH requirements:

6.1 to 6.5 (mildly acidic)

6.6 to 7.5 (neutral)

Patent Information:


Propagation Methods:

By dividing rhizomes, tubers, corms or bulbs (including offsets)

From seed; sow indoors before last frost

Seed Collecting:

Unknown - Tell us


This plant has been said to grow in the following regions:

Albany, California

San Francisco, California

Brookings, Oregon

Sweet Home, Oregon

Salt Lake City, Utah

Grand Mound, Washington

show all

Gardeners' Notes:


On Dec 10, 2010, redtitan from Rochester, WA wrote:

Mashua grew really well here. The plant I had grew vigorously and vined high up the apple tree it was next to. A trellis or an objective for it to climb really helps with this plant. Produced >5 lbs tubers on one plant, but we had a late frost (heavy frosts kill back the plant) this year. Plants except for "Ken Aslet" variety form tubers only after fall equinox, so late frosts help increase yield. Plant flowered in the fall.


On Feb 9, 2003, Michaelp from Glendale, UT (Zone 5a) wrote:

A close relative of the common nasturtium, all parts are said to be edible. Resistant to many insects, frost tolerant, high yielding. Can be eaten raw, are a little hot like the radish, when boiled they are not hot, but become mild and sort of sweet. It is said they like cool wet summers and do well in poor soils.


On Oct 7, 2001, Baa wrote:

A tuberous perennial climber from South America.

Has greyish green, rounded, lobed leaves. Bears small, solitary, cup shaped, orange-yellow flowers with red sepals and long spurs.

Flowers August to early October

Likes a moist, well drained soil in full sun and something to climb up or over.

Only hardy down to freezing and lifting the tubers to store in a frost free place over winter is the easiest option.