This section is from the book "The Complete Garden", by Albert D. Taylor. Also available from Amazon: The Complete Garden.
Generally speaking, flowers of all early-blooming shrubs, flowering upon wood of previous season, can be forced. The branches may be cut any time after January; but the best results are obtained when the branches are cut after the sap begins to run. Place the branches in water and spray tops several times daily to force bloom.
Amelanchier (white and pink)
Shad-bush Caragana frutescens (yellow)
Siberian Pea Shrub
Cercis canadensis (pink) Red-bud
Chaenomeles japonic a (pink and red)
Japanese Quince Colutea arborescens (light yellow)
Bladder Senna
Cornus mas (light yellow) Cornelian Cherry
Corylus americana (brown) Hazelnut
Deutzia gracilis (white) Slender Deutzia
Forsythia (all sorts) (yellow) Golden Bell
Kerria japonica (yellow) Globe-flower
Lonicera fragrantissima (pink and white) Early Fragrant Honeysuckle
Philadelphus (all sorts) (white) Mock Orange
Prunus cerasus (pink) Flowering Cherry
Prunus triloba (pink) Flowering Plum
Pyrus halliana parkmani Parkman's Crab
Ribes aureum (yellow) Flowering Currant
Salix caprea (grey) Goat Willow
Spiraea arguta (very fine) (white) Hybrid Snow Garland
 
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