Therefore they have similar efficiency and winter hardiness.

All of this station's introductions have excellent winter hardiness.

The Polish apple rootstocks were designed specifically for winter hardiness.Dr.

The latest revision, in 1990, shows 10 zones, each representing an area of winter hardiness.

Move plants of questionable winter hardiness into coldframes.

The 1990 map shows 10 different zones, each of which represents an area of winter hardiness for the plants of agriculture and the natural landscape.

The sweet onion had impressive winter hardiness well-suited for the climate of southeastern Washington.

But you can improve the winter hardiness of roses by using an autumn fertilizer that is almost entirely potash.

Tickets are $20, and the tasting will benefit the garden's research on ways to improve the winter hardiness of New York wine grapes.

He focused on winter hardiness and vigour.