What are some different types of erosion prevention?

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I am doing a project for an earth and space course and need to compare at least 4 different types of erosion prevention. All I can think of is retaining walls.

Answer
Well you can add grass cover, and shelter belts of trees to prevent soil being blown away by the wind, salt tolerant scrubs etc to stabilize coastal dunes, reducing tilling of the soil especially on hilly land, along shores concrete blocks or large sand bags packed close together can reduce beach erosion. Slowing down water flow velocity in streams help reduce erosion as does good dense plant cover anywhere.

Why do English perenniel gardens do so well in drab weather?

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I have a north facing backyard. I live at the beach in Southern California. Can't figure out why the perenniel gardens in England are so beautiful but get so little sun and are invariably damp from the rain. I would love an English perenniel garden back yard, but most everything dies. Any thoughts?

Answer
Primarily due to the moist,cool weather we enjoy here in the UK.Suggestions for your north border,
1.Anemone hupehensis.Pink,red and white flowers,grow well in partial shade.
2.Astilbe (Spirea).The arendsii hybrids suit any moist position.
3.Dicentra spectabilis.Requires moisture at roots,shade from strong sunshine.
4.Helleborus.Christmas rose.For a sheltered position in partial shade.
5.Hosta.Useful for north borders.
6.Phlox.Likes rich soil and shade from strong sun.
7.Primula.In variety.Growing as Phlox.
8.Ranunculus.aconitifolius flor-pleno,for a moist shady border.
9.Solidago.golden rod.
Hydrangeas and hardy fuchsia are others which may suit.Good luck,send me some oranges,please!

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