This section is from the book "The Gardener's Monthly And Horticulturist V20", by Thomas Meehan. See also: Four-Season Harvest: Organic Vegetables from Your Home Garden All Year Long.
Wahlenbergia is a genus being closely allied to Campanula, and affords us many very beautiful hardy herbaceous plants. W.grandiflora is particularly well known in American gardens by its very large flowers and parsnip-like roots. While at the nurseries of Messrs. J. Veitch& Sons, of Chelsea, England, last year, the writer was particularly interested in one with singular potato-like knobs on the surface of the ground, as well as a profusion of beautiful flowers. It is one of the Loveliest things of its class that could possibly be. The following is a representation of it as growing at Messrs. Veitch, with a description taken from Sir Joseph D. Hooker's magazine for 1875:
" In the whole genus, which is a tolerably uniform one in habit, I know of no feature so remarkable as the tuberous root stock of this, which resembles a cluster of potatoes placed on the top of the pot; the contrast of these grotesque •objects with the exquisitely graceful thread-like -stems and profusion of pearl-white rose-streaked blossoms is exceedingly striking, and recommends the plant as a desirable one for greenhouse, and probably for out-of-door culture. Care must be taken not to overwater the plant when not in flower,, or the tubers will soon rot".