44 ROCK AND WATER GARDENS 



charm. They must not be grown near large plants. 

 Division. 



Thymus. Thyme. On the outskirts of the rock 

 garden where there are no small plants, masses of 

 creeping Thyme are very beautiful. The poorest and 

 driest soil will suffice. Two beautiful kinds are the 

 wild white Thyme (T. serpyllum albus) and the woolly- 

 leaved Mountain Thyme (T. lanuginosus), with purple 

 flowers. Full exposure to sun. 



Tiarella. Foam Flower. An exquisite plant of the 

 hardiest description. The trailing foliage is tinged 

 with red and bronze, and the graceful spikes of creamy 

 pink flowers, when massed, give the rocks and stones 

 an almost foam-flecked appearance. Frequent division. 



Veronica. Speedwell. The trailing kinds should be 

 found in all rock gardens. V. rupestris and V. prostrata 

 are good. V. spicata, a native plant, soon covers the 

 ground with neat patches of foliage. Sandy loam. 



Viola. Violet. Described elsewhere. 



From the foregoing list, many families of rock plants 

 are omitted. However, the majority are either bulbous 

 or of shrubby habit, and will be found described in the 

 chapters devoted to them. 



