Which peren­ni­als will do best in my un­usual soil?

Ann El­liot, Buck­ing­hamshire

Gardeners' World - - Gardeners’ Question Time -

CHRIS­TINE SAYS You say you have 15cm of top­soil and be­neath that, gravel. So be­fore plant­ing any new plants, in­cor­po­rate lots of or­ganic mat­ter into the soil that has been taken out of the hole, then use this to re­fill the hole once the plants are in po­si­tion. Plants that will do well in this sit­u­a­tion in­clude Lil­ium su­per­bum, which pro­duces ma­roon-spot­ted flow­ers in late sum­mer to au­tumn on plants that grow to about 2m high. A lovely ground-hug­ger is Phlox adsur­gens ‘Wagon Wheel’, which has trail­ing stems cov­ered in pink flow­ers with petals that look like wheel spokes. Try tril­li­ums such as T. gran­di­flo­rum, which pro­duces white, three-petalled flow­ers, or T. erec­tum with deep red-pur­ple blooms. They like or­ganic mat­ter, so keep them well mulched ev­ery year.

Lil­ium su­per­bum pro­duces clus­ters of del­i­cate turkscap blooms

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