This section is from the book "Commercial Gardening Vol2", by John Weathers (the Editor). Also available from Amazon: Commercial Gardening, A Practical & Scientific Treatise For Market Gardeners.
An easily grown hardy herbaceous perennial, with 6-12 pairs of ovate leaflets that give a Fern-like aspect to the plant. The blue or white flowers appear in summer. There are several varieties, one dissectum, with finely divided leaves, and another - variegatum - has beautifully variegated leaves. The trade done is chiefly in the plants, and by nurserymen rather than market growers.