Half-hardy
Applied to annuals, this indicates that a plant is able to cope with temperatures down to 0°C (32°F) but not hard frost.
Half-hardy
A plant that will tolerate cooler temperatures. Half-hardy plants may be grown outdoors in summer, but won't survive frosts. Half-hardy shrubs and herbaceous plants may survive an average winter in sheltered or warm environments.
Half-Hardy Annual
Seeds: Half-hardy seeds can be direct sown after all danger of frost. They don't like being frozen in the ground, but don't need to wait until the soil warms.
Half-Hardy Perennials
If you live in a cold climate where many perennial ornamental grasses are not winter hardy, you can try raising the few perennial species that grow fast enough from a spring sowing to be treated as annuals.
Half-hardy annuals: These can be direct-sown outdoors after the threat of hard frost (temperatures below 25°F) is past.
HALF-HARDY - Just as the word depicts, not completely hardy. Good examples re pansies, snapdragons, sweet alyssum. They will tolerate some light frost and cold nights.
A half-hardy member of the sunflower family, the cardoon can reach 8 feet, although in Zones 7 or colder, half that height is a more reasonable aspiration.
As some half-hardy annuals and other bedding plants take a long time to flower from seed they need to be sown in January or February if they are to bloom by early summer.
Use half-hardy annual ground covers like moss verbena and low-growing plants like begonias to prop up perennials with heavy blooms and lanky stems that have a tendency to droop.
To plant a succession of flowering annuals that will last a full season - or even year-round, depending on your climate - use both hardy ('cool-season') and half-hardy ('warm-season) varieties.
The most extreme method, and one that is recommended for half-hardy plants like fuchsias and figs grown outside of their hardiness ranges, is trenching.
The one exception to the rule is the half-hardy annual, often designated by "HHA" in seed catalogues. This is a plant which is not devastated by early frost, and may, given the right conditions, come up a second or more time.
Oregano is a half-hardy perennial that can be grown outdoors as an annual or indoors as a perennial.
What is called the lemon verbena is another plant, a half-hardy shrub, grown for the sweet scent of its leaves. It should be kept in a cellar all winter and planted out in the spring.
Peruvian lilies, also known as Lily of the Incas, is a half-hardy perennial with the...read more
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This herb is a half-hardy perennial that's an evergreen in Zones 8 through 9. In Zones 6 and 7, you can grow the hardy variety 'Arp', or you can grow rosemary as a container plant that's overwintered indoors.
The leaves, used in cooking, are known as cilantro or Chinese parsley. This fast-growing half-hardy annual prefers cool weather. Plant in fall in mild climates; elsewhere, succession-plant through spring and summer.
A plant's hardiness is its resistance to, or tolerance of, frost or freezing temperatures. The word does not mean though, pest resistant, or disease resistant. A half-hardy plant is hardy in a given situation in normal years but may freeze in coldest ...
Hardy annuals can survive cold temperatures and some light frost, while tender annuals cannot tolerate cold temperatures and should be planted only after there is no more danger of frost. Half-hardy annuals can tolerate some cold temperatures, ...
Some annuals, such as snapdragons and pot marigolds (Calendula), will tolerate frosts. These are called hardy annuals. But freezing temperatures kill most of the others. These are called tender annuals. Half-hardy annuals will tolerate mild frost.
 See also: Hardy, Plant, Flower, Spring, Soil
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