This section is from the book "Commercial Gardening Vol4", by John Weathers (the Editor). Also available from Amazon: Commercial Gardening, A Practical & Scientific Treatise For Market Gardeners.
Ornamental flowering twiggy shrubs closely related to the Brooms (Cytisus), and easily grown in any garden soil, or even a poor soil. Most of them are easily raised from seeds. The best known are oetnensis, the Mount Etna Broom, 10 ft.; hispanica, the Spanish Gorse, with spiny branches; pilosa, trailing stems; tinctoria, the Dyers' Green-weed, with a tall-growing form, elatior; and virgata, 10-15 ft. - all with bright golden-yellow flowers freely produced in summer.