Cold temperature treatments stimulated inflorescence formation of Aguilegia × hybrida at the 12-leaf stage. Long photoperiods slightly advanced flowering further, but caused petiole elongation. Sprays of butanedioic acid mono-2,2-dimethylhydrazide (daminozide) at 2,000 mg/liter effectively prevented petiole elongation.
Seedlings of Chrysanthemum × superbum shasta daisy varied greatly in their requirements for flowering. Some vegetatively propagated clones of selected seedlings required cold in order to flower, some required long photoperiods, some required both, and some required neither. Flowering bedding plants were produced from seed in 6–8 months.
Lupinus Russell-hybrid seeds germinated 81% after 4 days when scarified with concentrated sulfuric acid for 45-60 min. Cold storage at 4.5° or 13°C growing temperatures and 18-hr photoperiods promoted flowering. Production of flowering bedding plants from seed required at least 9 months.
Cold storage for a minimum of 12 weeks induced flowering of Aurinia saxatilis. Seedlings became receptive to cold induction of flowering only after reaching the stage of 10 crowns/plant, approximately 7 months after sowing. The species is suited to production in 7.5 – 10 cm diameter containers.
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