GARDEN WALLS 209 



this plant away from its alpine fastnesses; now it is 

 found to grow easily if raised from seed, and at the 

 gardens at Trinity College, Dublin, it is grown as a 

 wall-plant, in projecting hollow brackets specially used 

 for it and other plants like it. Another alpine which 

 is very apt to 'miff off' if grown in the open border is 

 the Erinus aljoinus, yet I once saw the fine old brick 

 coped wall which bounds the garden of Denton Hall, in 

 Buckinghamshire, completely covered with this pretty 

 alpine in full flower, and since that I have seen it on 

 other walls, but not in such abundance as at Denton. 

 I have no doubt that many of the alpine primulas and 

 androsaces would grow on old walls, but I have not 

 tried them ; and, indeed, I think that most plants 

 which can stand drought and delight in bright sun- 

 shine would be worth trying, but it would be of little 

 use to try bulbs, though some tuberous plants, such as 

 the dwarf irises, would certainly grow in such posi- 

 tions. I say nothing of wallflowers, snapdragons, and 

 foxgloves, for they are native plants which will sow 

 themselves ; but seeds of the better sorts are worth 

 sowing, and I will only name one more flower which 

 should be planted on every wall where it does not 

 grow naturally, the wall toad-flax, Linaria cymhalaria. 

 This is not a true native, and is said to have been 

 brought from Italy, though found wild as far north as 



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