Can. J. Plant Sci. Vol. 49, 100 (1969)
1 Contribution No. 214.
Received August 29, 1968.

Research Station,
Canada Department of Agriculture,
Ottawa, Ontario.

Martin Frobisher is a hardy shrub rose that flowers continuously from June until frost. It has a good field resistancc to powdery mildew, Sphaerotheca pannosa (Wallr. ex Fr.) Lév. and appears to be immune to blackspot, Diplocarpon rosae Wolf. This hardy everblooming rose should be a useful plant for landscape architects as well as for home gardens where space is not a primary concern.


Martin Frobisher was selected from seedlings obtained by open pollination of the Hybrid Rugosa cultivar Schneezwerg.

FIG. 1. Hybrid Rugosa 'Martin Frobisher'.


Shrub.—Height is between 1.50 and 2.00 m. Growth habit is upright. The shrub is well formed and has a good foliage cover. The bark is reddish-brown and the upper part of the canes is spineless.

Foliage.—The color of the foliage is yellow-green. The number of leaflets per leaf varies from 7 to 9. The leaflets are oblong, 4 co 5 cm long and the edges are serrate.

Flowers.—The flowers arc fragrant, from 5 to 6 cm in diameter with an average of 40 petals and are arranged in clusters of 6 to 12. The color is Neyron rose, two-tone, RHS Colour Chart 56A to 56D. The petals are darker at the base, and the value of the color decreases toward the outer edge.

Chromosome number.—Somatic cells have 14 chromosomes.


This selection has performed well during the past six years in Ottawa and is considered an improvement over the commercially available Hybrid Rugosa cultivars. It has been grown since 1966 at different locations in Canada and in the United States, and reports on its performance have been favorable. It will be commercially available in 1970.