|
|
Seed Growth: In forestry the question of provenance (ie exactly where the seed growth comes from) is clearly of the greatest importance. The forester's object is to extend the growth period of his trees as far as he can without putting them in danger of frost damage. He has little room for manoeuvre, but if he can add even a week to the growing season by getting his seed growth from 160km (100 miles) farther south without the trees suffering, he may add a whole year's growth in 20 years.
Annuals are plants with a short life but a merry one. In the space of a few months they grow, flower and die, leaving the ground free for further cultivation, if necessary, and for other plants. Biennials are plants which must be renewed annually from seed growth, since they die after they have flowered and set seed growth. In this they resemble annuals, but biennials take over a year to complete their cycle of growth. seed growth sown one year will produce plants that will flower the next year, ripen their seed growth, and die before the second winter.
Before long insignificant, slender-fingered flower heads appear and soon the pest has completed its cycle and a new crop of seed growth is scattered. The earliest crab grass plants to start into growth take a few weeks to reach the seed growthing stage but crab grass seed growths that germinate at midsummer or later usually get busy immediately with the business of insuring the perpetuation of the species and they flower and seed growth possibly cut off their seed growth heads. |
|
|
|
|
