This section is from the book "The Gardener's Monthly And Horticulturist V26", by Thomas Meehan. See also: Four-Season Harvest: Organic Vegetables from Your Home Garden All Year Long.
Among hardy herbaceous plants that seem to meet with increased favor year by year, is the purplish blue larkspur, Delphinium formosum. It is a plant that quickly responds to good treatment. It is not uncommon to meet with it un-cared for in gardens, presenting an uninviting appearance, the leaves fallen from the lower part of the stem, and the flowers small in size and few in number. But treat it well; put it in good deep soil; mulch it in summer to keep the roots cool, and what a change there is! The leaves are of a deep green, clothing the stem from base to summit, the flower stem frequently four feet high and bearing as many as one hundred and fifty flowers on it, one succeeding the other until two or three weeks' time have passed.
The common mode of propagating this plant is to sow the seeds in spring. The plants, growing on for a year, flower the next season. There is a quicker way to flower them than this. As soon as the seeds are ripe, which is in September here, gather and sow them at once in a flower pot indoors. As soon as they are large enough prick them off into single pots or into boxes. They will make a nice growth the same season. As soon as the weather permits in spring plant them out - the earlier the better. From these plants flowers will be had the same season, thus saving a whole year.