Bulbs and other Modified Structures

Most horticultural plants are characterized by normal roots stems, leaves, flowers and fruits. There are, certain plants in which one or more of these parts have become highly modified. These plants constitute some of the most valuable and interesting flowering and vegetable plants.
The various types of bulbs and other modified structures may conveniently bi included in the following classification.
1. Bulbs.
a. Layered or tunicate. Examples: onion,garlic, narcissus, hyacinth,and tulip.
b. Scaly. Example: lily.
2. Corm, or solid bulb. Examples: gladiola and crocus.
3. Rootstocks
a. Rhizome. Example canna,banana,bamboo,and asparagus.
b. Pip. Example: Lily ot the Valley.
4. Stem tubers. Example : Irish potato and Jerusalem artichoke.
5. Fleshy roots. Example: sweet potato and dahlia.
Important and use:

It is appropriate to outline briefly several phases of interest related to the production and uses of bulbs and other modified structures considered in this chapter. Propagation Stock. The kinds of plants included in the forgoing classification are planted widely by commercial grower and home owners. This, then reates and need for planting stocks. Formerly most of the planting stock sas grown in foreign countries, notably in Holland . In recent years restrictions have been placed on importation of foreign-grown stock to lessen the danger of introducing new disease and insect pest. The effect of these to supply the need for planting stock. Commercial producing Washington, and other states, and the domestic supply in now being produced largely in these areas.

Forcing Certain Kinds of bulbs are used widely for forcing to produce blossom, usually at seasons when flowers are not plentiful. The3y are popular with commercial florists, who sell them as cut flowers or as potted plants, Bulbs are the most popular plant for forcing in the home. They may be grown in blows of water, in sand, or in sil.

Naturalized Beds. Bulbs are popular flower for naturalized beds, where they are allowed to grown largely undisturbed for a number of years. They are specially suitable for this purpose because they are hardy and are attacked by relatively few insect pests or disses, they normally bloom at a time of the year when flowers are scarves, and they grow several years with a minimum of care.

Economic Use: Several of the plants of this class have economic value because of the edible parts which they produce and their important as food plants. This is notably true of the Irish potato. sweet potato, banana,and asparagus.


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