After Bāle I came back once more to Cronberg. Nothing is so interesting, next to one's own garden, as the gardens one knows well, belonging to one's friends, especially when they have very different situations and soil. At Cronberg the soil is very strong and tenacious, and bakes into a hard crust, about as different to my Bagshot sand as can be imagined. In all I say or recommend, it is most important to remember that in stiff, heavy soils everything that grows well with me would do badly and require a perfectly different cultivation. The amateur should always recognise that when things do badly it is probably because of some mistake in cultivation, and that it is always worth while to try some other method.

I went for the first time to the famous 'Palmengarten' at Frankfort, which in its way is really beautiful, and a very well-kept, interesting public garden - half pleasure garden, half botanical. The greenhouses are clean and orderly, and arranged in much better taste than they would have been at home. There is much more attempt at grouping foliage plants, Mosses, Ferns, etc., than one generally sees. The same with the outdoor planting; though artificial and formal, it was done with considerable thought and originality, the beds being thoroughly carpeted to keep away weeds, which in that style of gardening is the only possible plan. The colour-contrasts were good; a brighter, hotter sun than ours, together with much watering, perfects this kind of garden. I found planting of effective groups in the grass was a distinct feature in gardens about Cronberg, and better done than I have ever seen in England, save in very exceptional cases. It is an art that can rarely be understood by gardeners, as I think it requires a certain amount of real art-training to be able to imagine effects both of form and colour. A well-planted White Variegated Maple ought to be in every garden, but it should not be allowed to get large and coarse. A contrast should be planted near it in the shape of broad-spreading leaves of some strong-growing, dark-foliaged plant.

A much more delicate mixture is a small red-leaved Japanese Maple and the Spirœa Ulmaria, the common British Meadow-sweet. In strong soils this is a lovely combination on grass. In this kind of planting, it is most important to remember that if two spiral or two bushy things are planted together they interfere with the grace of form which is aimed at. In the just-mentioned plants the small red Maple would stand out strong from the grass, and would represent massiveness of form and colour. The well-grown specimens of the Spiręa - sure to do well, as they are wild plants - represent the grace of spiral growth and light, soft, white or cream colour. I find Eucalyptus Gunnii the hardiest of all the gum-trees, and most especially pretty in colour and form for this kind of gardening; and it is also good for picking, as it lives well in water. These contrasts may be carried out in endless variety even in small gardens.

When in Germany I was much struck by a greenhouse full of the healthiest tree and winter-flowering Carnations I have ever seen. The gardener told me that the secret of the entire absence of injured leaves and spots from rust was that from July onwards, whether they are in pots or planted out, he syringed them once a week with the following mixture, which is also good for many other plants that are often blighted, especially Hollyhocks and Madonna Lilies: