Bird Watching (UK) - - Bird The World -

ADRIAN THOMAS RSPB wildlife gar­den­ing ex­pert It’s great to con­sider cre­at­ing green roofs on sheds and garages. If the roof can hold the weight of the soil, water, plants and maybe snow on top, and if it has a slope of un­der 20 de­grees (but not flat), it will need wa­ter­proof­ing that will also be root proof (such as EDPM pond liner). You’ll need raised edg­ing to hold in the 7-15cm of sub­strate, a mix 75% crushed rub­ble to 25% com­post. Make sure ex­cess water can drain away. Then plant! You’ll do best if your roof is in a sunny po­si­tion. Se­dum mats are fine, and don’t need as much sub­strate. But chalk downland mixes, in­clud­ing plants like Lady’s Bed­straw, also work and pro­vide more va­ri­ety.

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