Alyssum is always associated with lobelia—usually planted alternately along suburban front paths and all right, I suppose, if you like that sort of thing. Once available only in white, it can now be found in pinks and purples that have more charm. Ageratum, too, now comes in some really deep shades of lilac and blue, which makes it more appealing for the front of the box. Again, pack it in tightly.

Dianthus, the annual, is increasingly produced for window boxes and also for hanging baskets. Most varieties flower in flushes, three or four times during the season rather than continuously, so it is a good idea to plant a second basket three weeks later in the hope that when the flush in the first one is over you can quickly replace it with the second just coming into its best. Read the rest of this entry »

High summer, when everything in the garden is blooming and burgeoning in competition, is the time when window boxes should be planted very boldly. Colours in the summer must be bright to compete with the sun or perhaps make up for the lack of it.

Red geraniums and dark blue trailing lobelia are something of a horticultural cliché but for effect against stone or stucco they can hardly be bettered. As a change from the red geranium—like ‘Sprinter’, which is massed outside Buckingham Palace every year—you can have ‘Cherie’, which has soft salmon pink flowers and deeply zoned leaves, or ‘Ringo Salmon’, which is almost orange, or ‘Rose Marie’, a really intense pink. If your house is built of brick avoid all the colours and choose white, either ‘White Orbit’ or ‘Iceberg’, which will look asking if they would like them. Few would be so stunning. In fact when choosing geraniums thechurlish as to refuse, and most would be delighted to golden rule is to shop around because newer, moreexciting colours are introduced every season. When you have found a geranium in a shade you like, mass it for maximum effect. Read the rest of this entry »