USE OF THE GREENHOUSE DURING SUMMER WITH DIFFERENT CHRYSANTHEMUM INDICUM VARIETIES

A. Graifenberg
The greenhouse, particularly the plastic one, is used in Central Italy only for the early spring cultivation of tomatoes and melons. For the rest of the year the greenhouse is not utilized, because of the high summer temperature. This results in under-exploitation of the capital spent in the construction of the greenhouse.

In order to experiment on the use of the greenhouse during summer, immediately after the termination in mid-July of the early spring cultivation, the possibility was examined of growing Chrysanthemums, which will bloom during the last days of October. In that period the demand for this type of flower is particularly high in Italy and other Latin countries. Cv.Balcombe Perfection of eleven weeks (to flowering time), cv.Snowdown of 10 weeks, and the cv.Indianapolis and Marble, both of nine weeks were grown.

The transplanting of the rooted cuttings took place on 14 July 1972 in a glasshouse, situated at Marinella di Sarzana (La Spezia).

Two-thirds of the plants of each variety were cultivated single-stem without pinching and one-third were cultivated multi-stems with pinching. The blooming of the cv.of nine weeks (both pinched and non-pinched) occured before November 1st. The stems of the pinched plants were observed to be short and not marketable.

The plants of the cv.of ten weeks which were not pinched formed flowers shortly before 1 November; the pinched ones bloomed during the last days of October and the first days of November.

The cv. of eleven weeks bloomed after 1 November.

It is possible to cultivate chrysanthemums in a greenhouse immediately after the end of the early spring cultivation. But to have flowers in bloom before 1 November, one must use the non-pinched 9–10 weeks varieties.

Graifenberg, A. (1974). USE OF THE GREENHOUSE DURING SUMMER WITH DIFFERENT CHRYSANTHEMUM INDICUM VARIETIES. Acta Hortic. 43, 167-172
DOI: 10.17660/ActaHortic.1974.43.17
https://doi.org/10.17660/ActaHortic.1974.43.17

Acta Horticulturae