Close up of blue Vinca minor flower

The Thrillers are the architectural plants, usually the tallest plants in the display. They provide the structure for your planting combination.

Next come the Fillers, the second layer of planting in the container. They add mass to the planting, as well as providing a contrast in shape and texture.

Finally, there is the third layer of plants, the Spillers. These are the trailing plants which, when squeezed in around the edge of the planting, will tumble over the sides and soften the boundaries. Where the filler can contrast with the thriller, the spiller can unify the display by echoing elements of the other two layers – picking out a secondary colour, for example. Plants with good spiller qualities are often...

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Geranium cinereum Ballerina - ideas for container plantings from Weatherstaff garden design

The Thrillers are the architectural plants, usually the tallest plants in the display. They provide the structure for your planting combination.

Next come the Fillers, the second layer of planting in the container. They add mass to the planting, as well as providing a contrast in shape and texture. Think mounds, if your Thriller is a spire.

Here are my 6 choices for plants with superb filler qualities.

Geranium

The colourful summer bedding pelargoniums of course make fantastic summer container plants. If you want a longer lasting display, though, choose from the hardy perennial geraniums, known as cranesbills. They are superb for providing long season flowering year on year. Some of the more vigorous ones, like Geranium Ann Folkard, make...

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