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plants-vr-07-rhizomes-2 - growth underground EARLY SPRING...

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Vegetative reproduction 7 Rhizomes - continued Life cycle The annual cycle of a rhizome is similar to that of a corm. In late Spring/early Summer, food from the leaves passes back to the rhizome, and a lateral bud uses it, grows horizontally underground, and so continues the rhizome. Other lateral buds produce new rhizomes which branch from the parent stem. The terminal buds of these branches curve upwards and produce new leafy shoots and flowers. Contractile adventitious roots grow from the nodes of the underground stem and keep it at a constant depth. this year’s flower stalk this year’s leaves last year’s leaf bases remains of leaves from 2 years ago lateral bud food passes to growing regions stem (rhizome) swollen with stored food food from leaves passes back to stem lateral bud continues
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Unformatted text preview: growth underground EARLY SPRING LATE SPRING flowering stem growing point scale leaves adventitious roots part of old rhizome node i nternode Rhizome of couch grass ( Elymus repens ) Couch grass ( Elymus repens ), has a rhizome which grows rapidly underground, sending up shoots at frequent intervals and colonising areas with its coarse grass. Couch grass is very difficult to eradicate using conventional cultivation methods because if even a small part of rhizome is left in the soil it will quickly grow and produce new shoots. Chemical control is possible using a glyphosate herbicide, but care must be taken to avoid the herbicide reaching other plants. Bracken has a deep, rapidly growing rhizome which makes it very difficult to eradicate. © D.G. Mackean...
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