46 HARDY PERENNIALS 
when to deliver, and in other cases it is up to the 
Nurseryman to point out to his dients the advis- 
abihty of sending some of the plants in Autumn, and 
holding others over until Spring. 
Neither of the two general planting seasons is 
really suitable for Pyre thrums. Autumn planting 
generally results in rotting of the crowns in Winter. 
Spring planting spoils the season's flowering. The 
best and proper time is immediately after flowering 
is over. If the clumps are lifted and divided, then 
they make fresh growth immediately, the only 
necessity being to give them a thorough soaking 
if the weather happens to be very hot and dry. 
Alternate rains and frosts frequently cause roots in 
freshly dug soil to be heaved out, and it is well to 
look round occasionally and press back firmly any 
that have thus lost their grip. In early Spring one 
may notice a plant with its crown and young growth 
looking withered and unhappy, and closer examina- 
tion will generally reveal that the soil has so fallen 
away that the roots are exposed to the cold, cutting 
winds. When the cavity is filled with soil, trodden 
firmly, quick recovery generally takes place. 
