True annuals are plants which will complete their life cycle within twelve weeks of sowing. Biennials require two growing seasons to do so and are usually sown in summer to blossom during the following spring and summer.
Many different plants which botanists would specify as perennial can be treated as annuals, even though some are half-hardy and, while able to flower well for one season, aren’t sturdy enough to be used for at least 1 year. Half-hardy annuals are usually increased in a greenhouse, then ‘pricked out’ (transplanted, a few centimeters apart from bigger boxes) and grown under protection before being planted outside.
The winter hardiness of biennials is contingent upon the district where they should be grown. But there are significant benefits in planting out in late summer or fall for those hardy enough to winter well. For example Canterbury Bells which are planted outside as transplants from the fall will flower well the next summer, but if planted out in the spring that they tend to not flower until twelve months after!! Sweet Williams act in a similar manner.
Biennials are often sown in a seedbed in the open, or in boxes in a frame or greenhouse, and transplanted as seedlings. They are then placed in their last quarters in late fall, as in the case of Wallflowers that do best in cool areas. It’s fairly significant to plant out forget-me-nots and cinerarias in the fall, as these two flower early and therefore have to be planted out well before flowering time.
Cinerarias are appropriate only for areas free from frost but in these areas they’re extremely showy and they’re particularly helpful for shady gardens. There are short, medium and tall kinds and the colour range is broad. Especially good are the wealthy blue sunglasses.
Plants which aren’t frost hardy include Begonia semperflorens, coleus and impatiens. The latter have become extremely popular plants. They can be found in both short and taller varieties and in numerous double flowered cultivars, which are mainly propagated by cuttings. Impatiens grow well in full sun if watered or in color and are popular container plants for patios.
Hardy biennials are plants which are sown annually before they’re expected to blossom. They’re raised in a seedbed outdoors or in a cool, shady frame and could be thinned out or transplanted when big enough. For the best results planting out should be carried out in the autumn. If they’re purchased from the garden center in punnets or seedling trays, plant them out early in the season. In areas where the winters are mild, planting at the colder time will lead to little flowering plants, except possibly with pansies and violas.
Annuals which may be sown directly in nicely prepared flowerbeds and that come fast into blossom are guaranteed to be popular if they’re capable of sustaining flowering for a protracted time period. There are a lot of suitable varieties to select from and typically they could be sown in boxes and transplanted. Before sowing time, prepare the growing website. If the soil is lumpy and thick, mulch needs to be worked in and planting mixture placed on the surface. Then select a dry day, apply a tiny general fertilizer and then rake it in. Seed can be broadcast or it may be sown in shallow drills.
Some seedlings can be safely transplanted but the following don’t transplant easily: clarkia, eschscholzia, godetia, gypsophila, linaria, nigella and poppies.
Half hardy annuals have to be increased in a frame or greenhouse or in a couple of cases sown outside after the threat of frost has passed.
Germination time changes, and many kinds require pricking into pots or boxes of potting compost. Some of the seeds like lobelia, begonias and petunias are extremely small and have to be sown carefully and kept from direct sunlight.
Nowadays the many garden centers often do all this work for you offering a fantastic assortment of these plants n punnets prepared for planting. But it might be that you wish to use seed collected from your own garden, or want to increased varieties unavailable in punnets. In any case you’ll realize that increasing your own seedlings can add a lot of attention to your garden.