All tall-growing perennials will need stakes to support them. Care must be taken not to injure the roots when putting these in. The stalks can be tied with twine.
Dividing
Perennials can be divided if they grow too large. With summer-flowering plants this should be done in October or November, and with spring-flowering plants in June. In dividing you simply dig up the plant and break off as much of it as you want, being careful not to injure the roots. As, however, there are many plants which, to be divided, must be cut, and as this is an operation which requires some skill and knowledge, it would perhaps be better to take advice.
Perennials From Seed
Snapdragon, wallflower, pansies, and hollyhocks are very easily grown from seed. They can be sown in June (wallflowers are best sown in April) in boxes, and thinned out and transplanted to permanent places as soon as they are large enough. They will blossom the following year.
Seedlings
Seedlings of most perennials can be bought for a few cents a dozen. They should be planted as quickly as possible and watered well, and they will flower the following year.
Consult a good nurseryman's catalogue for a list of hardy perennials, as for the annuals.