Annual flowers good for a window box

Flowers for sunny window boxes

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By: Sandy Feather ©2010
Penn State Extension


Q. I have window boxes that get baked in the hot sun most of the day. Can you suggest some annual flowers that can take this southwest exposure and still look fresh?

A. You did not say how big your window boxes are, but the following plants should do well in typically purchased window boxes. These same plants will also do well in flower beds that have a hot southwest exposure. When you plant your window boxes, mix about one part compost to two parts potting soil to help hold moisture and provide some nutrients.


Adding the finishing touches to a Window Box

It also helps to mulch the soil surface after planting your window box with a thin layer of finely shredded bark or fine bark nuggets.

Ageratum - Ageratum houstonianum

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Vinca - Catharanthus rosea

Pot marigold - Calendula officinalis

Cockscomb, Plumed celosia - Celosia cristata

Dianthus - Dianthus chinensis

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Dahlberg Daisy - Thymophylla tenuiloba

Gaillardia - Gaillardia pulchella

Gazania - Gazania rigens

Gomphrena - Gomphrena globosa

Strawflower - Helichrysum bracteatum

Licorice Plant - Helichrysum petiolaris

Lantana - Lantana camara

Sweet Alyssum - Lobularia maritima

Bush zinnia - Melampodium paludosum

Dwarf Cupflower - Nierembergia hippomanica

Geranium - Pelargonium x hortum

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Petunia - Petunia x hybrida

Portulaca - Portulaca grandiflora

Mealy Cup Sage - Salvia farinacea

Scarlet Sage - Salvia splendens

Dusty Miller - Senecio cineraria

Marigolds - Tagetes  spp. & cvs.

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Black-eyed Susan Vine - Thunbergia alata

Nasturtium - Tropaeolum majus (‘Alaska’ has variegated foliage)

Creeping Zinnia - Zinnia angustifolia