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Sunday, March 25, 2007

Bulbs And Tubers

Miniature Lemon Jonquils

Plants that have bulbs and tubers are perennials, their main characteristic being the formation of an underground storage organ which is the basis of life of the same or a substitute plant in the following vegetative period.

The one-year vegetative cycle is typical of this group, during which the plant forms its aerial organs, flowers, usually seeds, and accumulates nutritional substances in the underground storage organ for further vegetation. Each vegetative period is concluded with a dormant period, the beginning of each cycle being at the same time the end of the previous one. The course of the growing cycle in different genera and species does not keep to the same timetable, but it always lasts one year. The whole cycle takes place over a period of twelve months, though the beginnings and ends may not correspond to the beginning and end of the calendar year.

Blue Hyacinth

According to the calendar, almost all plants of this group would have to be considered as biennials, as their vegetative cycle most nearly approaches the group of flowering biennials, such as pansies, daisies and forge-me-nots. Basically, biennials are also annual plants, whose vegetative cycle covers part of two calendar years.

The beginning of the vegetation of the various genera of bulbous and tuberous plants varies, being dependent on the advent of favourable climatic conditions that trigger off the beginning of the life cycle. However, no new vegetative cycle can begin until after the completion of the last one. This fact must be taken into account when cultivating these plants in the garden, and especially not forgotten when forcing flowers.

Phalaenopsis, Golden Treasure Yellow Moth

The beginning of the growing cycle of bulbs, corms and tubers is not usually the same as the time when the aerial parts of the plant are formed. Indeed, this may be considered a major characteristic feature of this group of plants. Whereas in the majority of perennials the new growing period starts with physiological and biological changes in the parts of the plant that are above ground, in bulbs and tubers considerable changes occur first in the underground storage organs, from which the aerial parts only grow later.

In generative reproduction, only in the first year of their lives do bulbs behave like most other plants. Their life cycle starts with the germination of the seed and the formation of the first vegetative organs. Soon afterwards comes the foundation and development of the underground storage organ (the bulb or tuber), the main organ of these plants. The moment the bulb comes into being, the plants start to differ from others and become, not only biologically but morphologically, true members of their group.

Bulbs and tubers are cultivated in gardens for two reasons; partly for decoration (the ornamental part of the garden), and partly for cutting (the useful part of the garden). Some plants are more suitable for planting out of doors, others are more effective cut, and displayed in vases. An example of flowers that are much more decorative and lasting in vases than in flowerbeds is gladioli.

Pink Gladioli

Flowers planted in the ornamental part of the garden should beautify it for as long as possible, so it is not suitable to use them as cut flowers. This applies especially to tulips, lilies, daffodils, snowdrops, snowflakes and fritillaries.

One of the most important and special qualities of many species of bulbs is that the flowers can easily be brought on or forced, even in the most critical winter months or early spring. Owing to lack of light in the winter, most other plants cease flowering, so it is mostly flowers from bulbs that herald the approaching spring into our parks and gardens.

Uses of bulbous and tuberous plants are as follows:
  • For decorative planting in gardens
  • For planting outdoors for cutting
  • For cultivation in pots indoors
  • For bringing on and forcing
Purchase your favourite bulbs and tubers at Petals or Spring Hill Nursery. Lots of discount coupons can be found at Coupon Chief. Start your your kitchen or vegetable garden with these coupon deals. Surprise your love ones with beautiful bouquets of flowers gifts, saying "I Love You" or "I Miss You", anytime and anywhere. In addition, you may send your mum flowers this coming Mother's Day using these coupons!



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