Cultivation of Annual Plants
- In gardening, annual plants are often grown outdoors during the spring and the summer.
- Most of the domesticated grains are annual herbs including most of food plants. But a few gardeners (or farmers) grow biennial (example carrot, parsley and celery) or perennial herbs (bell pepper, tomato, sweet potato) in their lands for convenience.
- A few perennial ornamental plants are grown as annuals like coleus, impatiens, pelargonium, wax begonia, petunia, snapdragon etc.
- A few names of true annuals are – beans, corn, cauliflower, lettuce, marigold, peas, rice, wheat, watermelon and zinnia.
- One life cycle of seed-to-seed may occur in about a month, but others might need months.
- Oilseed rapa takes about 5 weeks to complete one life cycle from seed-to-seed when kept under a bank of fluorescent lamps (which are used in school classroom).
- Herbs that complete their life cycle in weeks, often have to spend the rest of year in dry conditions.
- Growth in Summer The annuals that grow during the summer show the following kind of growth -
- Sprout during the early summer —> flower blooms during the summer months —> seed —> die during late warmer months
- Example – lawn weed crabgrass.
- The seeds lie dormant until the warmer months start.
- Growth in Winter The annuals which grow in winters follow the following pattern of life cycle -
- Germinate begins in the late autumn or early winter —> live through the winter months —> blooms during the late winter or early spring —> set seed and die.
- Seeds start germination only when the soil is coll, else experience dormancy till winters are felt.
- These plants mostly grow low to the ground level.
- Example – chickweed, deadnettle, henbit and winter cress.
- Most of the herbs which grow during the winter are more important ecologically, because they prevent soil erosion.
- Animals and birds are capable of feeding on them during the winters.
- Commercially, winter annuals are considered as weeds and host to pests and fungal diseases.
the t o http://herbs.ygoy.com/2010/07/02/annual-herbs-what-are-annual-herbs/
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