J. Mosegård
For many years Danish nurseries produced some species of plants in pots. It was mainly tender plants such as Clematis and other climbers, but especially plants difficult to transplant in a convenient size without having a root ball, f.i. Cytisus and Pyracantha. The plants were deep bedded and a vigorous rooting over the edge and through the bottom hole took place. This was partly due to inefficient water supply and lack of nutrients. Special deep clay pots, designed to woody plants were applied. It was the general opinion that woody nursery plants require a particularly deep pot, though nobody was able to tell the reason why. The narrow pot gave a bigger plant density on the bed of cultivation and also required a minimum of space during transport. This form of cultivation has very little in common with modern container growing.

About 1955 Mr. Niels Poulsen started an experimental container culture in D.T. Poulsen's nursery. The American example was followed and the containers applied in this trial were old tin cans. Even though it was a rather large layout, the result was not particularly good. Partly because it was difficult to remove the plants undamaged from the cylindrical cans. The growing medium was ordinary sandy soil. This trial was not repeated.

In 1960 the nursery owner Mr. Ancher Simonson asked me to develop a method by which it would be possible to overcome the economical and practical difficulties which inevitably would arise in connection with a continued root ball culture of conifers in overdimensioned size. After some time I presented a sketch of a container culture based on split concrete cylinders held together by steel wire, a growing medium of ample peat and some soil and irrigated with liquid fertilizers through drip nozzles. The method was never put into use as Mr. Ancher Simonson got ill and other persons interested in this system first turned up later on.

In 1963 the French nurseries collectively arranged a very beautiful collection of conifers for further culture at the Opening Exhibition of I.G.A. 63 in Hamburg. It is very likely that this exhibition inspired the two nurserymen, Stroebel in Holstein, W. Germany, and K.J. Eggert Pedersen, Denmark, to take up a similar culture technique, which I found an excellent idea and wished to back up. The purpose of container growing young plants is to ensure a more reliable planting and give the plants a good start. This technique fell out to full satisfaction.

It ought, however, to be a natural thing to combine the mentioned two

DOI: 10.17660/ActaHortic.1969.15.1