The pupils should observe the second year's growth of biennials.
They must be carefully watered, and shaded as above directed for Biennials.
Snapdragons may be treated as annuals or biennials, and each has its own difficulty.
Biennials, and also most perennials, must be raised every year to keep up the supply.
Biennials and perennials should be sown before the middle of the ...