Bloei van sering aan afgesneden takken

W. Sijtsema

Research output: Thesisinternal PhD, WU


Investigations were described on the forcing of cut branches of Syringa vulgaris cv. Mad Stepman. Flower buds were initiated between approximately 21 June and 15 September. The stages of initiation were described and photographed. Flower buds were in summer rest from the beginning of June; this rest changed to winter rest with decreasing temperatures in September-October. Winter rest was shorter with low temperatures after the time of deepest rest (15-31 October). Winter rest could be broken artificially by 4 weeks at -1°C.
Temperatures just above zero had a smaller rest-breaking effect, which decreased further if temperature rose to at least 8°C.

Outdoor rest was broken after 3 weeks temperatures below 8°C. GA 3 (a gibberellin) did not break winter rest.. After rest-breaking the base of cut branches had to be disinfected for 6 hours with 0.02 % Scabex (organic mercury). Thereafter the buds could be brought into flower in a solution containing AgN0 3 0.003 and oxytetracycline sulphate 0.003 (bactericides), cladox filtrate 5 (fungicide), Ca (NO 3 ) 2 0.2, sucrose 3, boric acid 0.01, citric acid 0.02-0.01 and glycerol 0. 1-0.2 %.

Optimum temperatures during forcing were approximately 24°-26°C, gradually decreasing to at least 18°C during development of the racemes.
Original languageDutch
QualificationDoctor of Philosophy
Awarding Institution
  • Wageningen University
  • Wellensiek, S.J., Promotor
Award date9 May 1962
Place of PublicationWageningen
Publication statusPublished - 1962
Externally publishedYes


  • ornamental plants
  • cut flowers
  • oleaceae

Cite this