This section is from the book "The Gardener's Monthly And Horticulturist V24", by Thomas Meehan. See also: Four-Season Harvest: Organic Vegetables from Your Home Garden All Year Long.
This is an excellent climber for a warm greenhouse, and flowers freely when properly treated. It should not be pruned much, and none of the old flower-stems must ever be removed. It flowers again and again on the same flower-stalk; hence, unless for use as cut flowers, none of these should ever be removed. In the winter season they hang in withered-looking bundles; but in the early spring the sap floods the channels with new life, and a fresh raceme is thrown out from the extreme point of last year's flower-stem. And this goes on year after year, while other pendents of dazzling brightness spring forth near the base of the flower-stems. Those also that have been shortened back sometimes break into fresh clusters of blossom. Many of them, however, die back ; and, unless obliged to cut for the flowers, none of the old flowering branches should be cut at all. When the new flower-stem shoots forth, any dead points beyond it may be cut off. Another great advantage arises from this succes-sional elongation of the flower-bearing branchlets. Almost any length of raceme may be secured for twisting around the stems of stands or vases.
This enables the decorator to place the flowering blossoms of this brilliant plant in telling positions to which shorter flower-stems, that must from necessity have one end in the water, could never have reached. Many of the common Passion flowers have beautiful foliage, and sometimes coerulea and other varieties will keep open throughout a long night. Though these lack the brilliance and size of those I have indicated, the whole of the Passion flowers are beautiful and interesting. - Gardening Illustrated.