Colour is one of the most powerful tools in garden design. It shapes mood, creates harmony (or drama), and helps turn a collection of plants into a cohesive, intentional space. Whether you’re planting a small patio or a large border, thinking in colour themes can completely transform the end result. This guide will help you understand how to use colour effectively—through flowers and foliage—and give you plant inspiration for every major colour group. Why Grow by Colour? Planting by colour isn’t just about aesthetics—it’s about experience. Cool colours (blue, purple, white) create calm, relaxing spaces Warm colours (red, orange, yellow) bring energy and vibrancy Soft tones (pinks, pastels) add romance and gentleness Foliage colours provide structure and year-round interest By grouping plants thoughtfully, you can: Make small gardens feel bigger Create focal points Guide the eye through your space Extend seasonal interest Colour Combinations That Work 💙 Blue & White – Calm and Elegant A timeless pairing that feels fresh and open. Perfect for evening gardens as white reflects light beautifully. 💜 Purple & Yellow – Bold Contrast These sit opposite on the colour wheel, creating a vibrant, eye-catching display. 💗 Pink & Purple – Soft and Romantic A harmonious blend that works beautifully in cottage-style gardens. ❤️ Red & Orange – Warm and Energetic Great for creating impact and drawing attention to key areas. 💛 Yellow & Green – Fresh and Bright Yellow flowers paired with lush green or lime foliage feel uplifting and natural. 🌿 The Power of Foliage Flowers may come and go—but foliage is constant. Don’t overlook: Silver foliage (e.g. lavender, artemisia) → cools down bright colours Dark foliage (e.g. heuchera, physocarpus) → adds depth and contrast Variegated leaves → brighten shady areas Lime-green tones → energise planting schemes A well-designed garden often relies more on foliage than flowers for structure and balance. 🌼 Plant Lists by Colour Below are plant ideas grouped by colour—these include both flowering plants and foliage plants. Our Top Blue Plants Delphinium Salvia ‘Caradonna’ Nepeta (Catmint) Hydrangea macrophylla (blue varieties) Agapanthus (blue) Veronica spicata Scabiosa ‘Butterfly Blue’ Campanula Eryngium (Sea Holly) Brunnera ‘Jack Frost’ Myosotis (Forget-me-not) Ceratostigma (Plumbago) Lithodora Gentiana Lobelia erinus Meconopsis (Himalayan poppy) Perovskia (Russian sage) Iris (blue varieties) Anchusa Evolvulus (Blue daze) Our Top Purple Plants Lavender Allium Verbena bonariensis Heuchera (purple foliage) Buddleja (purple varieties) Petunia (purple) Clematis (purple varieties) Aster (purple) Dahlia (purple) Salvia nemorosa Geranium ‘Rozanne’ Tradescantia Basil (purple varieties) Ajuga reptans Penstemon (purple) Echinacea (purple) Scaevola Osteospermum (purple) Heliotrope Physocarpus (dark purple foliage) Our Top Pink Plants Roses (pink varieties) Dianthus Cosmos Begonia (pink) Camellia (pink) Azalea (pink) Phlox Astilbe (pink) Peony Nerine Cyclamen Gaura Kalanchoe Impatiens (Busy Lizzie) Petunia (pink) Geranium (Pelargonium) Hydrangea (pink varieties) Sakura (ornamental cherry) Foxglove (pink) Verbena (pink) Our Top Red Plants Roses (red) Tulips (red) Begonia (red) Dahlia (red) Salvia splendens Crocosmia Heuchera (red foliage) Acer palmatum (red foliage) Berberis (red foliage) Geranium (red) Poppy (Papaver) Anthurium (indoor) Cordyline (red foliage) Canna Photinia ‘Red Robin’ Skimmia (red berries) Fuchsia (red) Petunia (red) Coleus (red foliage) Chrysanthemum (red) Our Top Orange Plants Marigold (Tagetes) Calendula Geum Crocosmia (orange varieties) Dahlia (orange) Begonia (orange) Zinnia Helenium Tithonia (Mexican sunflower) Eschscholzia (California poppy) Lantana Canna (orange) Kniphofia (Red hot poker) Gazania Osteospermum (orange) Cosmos (orange varieties) Rudbeckia (orange tones) Heuchera (amber foliage) Coleus (orange tones) Euphorbia ‘Fireglow’ Our Top Yellow Plants Sunflower (Helianthus) Rudbeckia Coreopsis Narcissus (Daffodil) Tulips (yellow) Primrose Forsythia Achillea (yellow) Dahlia (yellow) Calendula Geum (yellow) Bidens Hypericum Mahonia Euphorbia Sedum (yellow varieties) Viola (yellow) Chrysanthemum (yellow) Ligularia Choisya ‘Sundance’ (gold foliage) Our Top White Plants Hydrangea (white) Rose (white) Jasmine Lily (white) Cosmos (white) Phlox (white) Camellia (white) Gardenia Alyssum Anemone (white) Gaura (white) Petunia (white) Dianthus (white) Digitalis (white) Viburnum (white flowers) Deutzia Spiraea (white) Iberis (Candytuft) Helleborus (white) Nicotiana (white) Final Thoughts? Growing by colour is one of the simplest ways to elevate your garden design—from random planting to something that feels intentional and cohesive. Remember: Use contrast for impact Use harmony for calm Let foliage do the heavy lifting Repeat colours to tie everything together Your garden doesn’t need to include every colour—sometimes the most striking spaces are built around just two or three well-chosen tones.