Influence of Spacing on Yield of Buddleia and Salix Grown as Cut Flowers and Stems

Abstract

Plants of Buddleia davidii ‘Black Knight’ were planted on 165, 80 or 45 cm (5.5, 3 or 1.5 ft) centers in September 1991 and plants of Salix alba ‘Britzensis’, Salix × erythroflexuosa ‘Scarlet Curls’ and Salix chaenomeloides were planted on 90, 60 or 30 cm (3, 2 and 1 ft) centers in April 1991. Stems of all taxa were harvested for three years. The number of harvested stems per plant decreased but the number of stems/m 2 increased with increasing plant density in all taxa. No significant differences in stem length or stem diameter occurred except with Salix alba ‘Britzensis’ in which the longest stems occurred at the highest density, regardless of year of harvest.