from The Century Dictionary.
- In horticulture, noting an intermediate grade between tender and hardy: said of plants which withstand a little frost, but not ahard one, and are sown or planted out after frosty weather is past and before the weather becomes thoroughly settled. Sometimes used also for plants which will live out of doors throughout the year if given shelter or protection.
from Wiktionary, Creative Commons Attribution/Share-Alike License.
- adjective botany A
plantwhich requires protection against frost.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- adjective (of plants) requiring protection from frost
Sorry, no etymologies found.
In the meantime, and if you have the room, it is canny to prepare your half-hardy annuals by acclimatising them to being outside.
Once the all-clear sounds, the first job is to harden off the half-hardy annuals.
DAVE SELF, WYLD WEST ANNUALS: These are Pentis; these are a great half-hardy perennial.
Ryle compares the “jargon” words of epistemology, ethics, aesthetics, etc. to “half-hardy annuals” rather than “hardy perennials” because there is no special field of knowledge (save philosophy itself) by which philosophers get their mastery of concepts, say, of Cognition, Sensation,
There is a race of quill-drivers, confined in the columns of the budget between the first degree of latitude (a kind of administrative Greenland where the salaries begin at twelve hundred francs) to the third degree, a more temperate zone, where incomes grow from three to six thousand francs, a climate where the bonus flourishes like a half-hardy annual in spite of some difficulties of culture.
March and the plants treated in the manner usual for half-hardy annuals, or a sowing can be made in the open towards the end of April.
The most satisfactory mode of cultivation is that of a half-hardy annual.
= = -- These require the same general treatment as advised for half-hardy annuals.
The present month is the one during which all tender or half-hardy plants used in summer gardening are "housed," or removed to their winter quarters under glass.
-- Elegant half-hardy annuals, which can be grown as specimens for the conservatory, or in quantity for open borders.