Origin of half-hardy
Examples from the Web for half-hardy
The half-hardy ones must be sown on a slight hotbed, where they should remain till strong enough to be planted in the border.Gardening for the Million|Alfred Pink
Wigandia is a half-hardy perennial, grown exclusively for its noble tropical foliage.
Sow stocks, dahlias and a few tender and half-hardy annuals, on a slight hotbed, or in pots.
The half-hardy varieties should be sown from January to March in pans placed on bottom heat.
Among the most useful of the greenhouse species are sanctum or palæstinum, spectabile (half-hardy), and spirale.The Book of Bulbs|Samuel Arnott