THE WHITE ROCKERY 107 



and it seized the moment to flower. F. undulata 

 is an interesting tigridia, but I have never yet 

 flowered it either under glass or in the open. An- 

 other irid I have muddled is the black and scarlet 

 Mexican, rigidella orthantha. It makes strong, pro- 

 mising growth, after the fashion of similar things, but 

 never attempts a flower. Coming, as it should, in 

 October, it may be unreasonable to expect success 

 Pohlia platensis does little better, though this is really 

 not in the least difficult. It flowered once with me, 

 and very beautiful and interesting it was ; but since 

 then, though vigorous, no bloom-spike thickens. 



Some people are surprised to hear that the tube- 

 rose polianthes tuberosa can be flowered out of 

 doors; yet in a warm, sandy bed they will do well, 

 given a hot summer. Planted during spring, they 

 flower with autumn, and come a delicate white, 

 shaded with pink, rather than the pure white of the 

 pot plant. Agapanthus, the blue Mexican lily, is 

 certainly hardy, and does far better with me in the 

 open than elsewhere. If planted in light, rich, but 

 sandy stuff, well drained and sheltered in reason, this 

 grand thing may be trusted, even though the frost 

 cuts it pretty near to the ground in winter. The 

 white varieties are perhaps more tender than the 

 blue. Albuca Nelsoni is a handsome Cape bulb, and 

 its spikes of white and green flowers rise finely above 

 the foliage. It is hardy enough with me, and in- 

 creases. Of the onions, I like azureum, magicum, 

 neapolitanum, pedemontanum, and the old yellow 

 moly. Allium is hardy enough, and there are very 



