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 alpinus, 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 bo 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 cymbalaria. 

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

 brought from Italy, though found wild as far north as 







