Half-hardy annuals
Half-hardy annuals such as cosmos, petunia and salvia die if exposed to the cold, so they can't go into the garden until after the last frost. Sow indoors in spring. They'll keep going until killed by the first autumn frost.
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 annuals: These can be direct-sown outdoors after the threat of hard frost (temperatures below 25°F) is past.
Hail Half-Hardy Annuals
In any mild-winter climate, there are a handful of cold-hardy annuals waiting to be discovered for wintertime entertainment. Consider planting dusty miller, dianthus, flowering cabbage and kale, pansies, and snapdragons.
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.
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.
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.
The plants are then removed, making way for next season's display. Spring bedding is composed of spring-flowering bulbs, hardy perennials and biennials. Summer bedding plants include hardy and half-hardy annuals, ...
Start with cool-season annuals planted in early spring to bloom within 6 weeks or so. As the days grow longer and the sun beats down in midsummer, replace those cool-season plants with half-hardy annuals.
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.
 See also: Hardy, Frost, Annual, Plant, Half-hardy
  
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