Arranging heritage plants in an outdoor plant box requires a thoughtful approach to ensure both aesthetic appeal and healthy growth. Start by selecting plants with complementary growth habits and sunlight requirements. Taller heritage varieties like hollyhocks or delphiniums should be placed at the back, while medium-height plants such as lavender or sage can fill the middle. Low-growing herbs like thyme or creeping rosemary work well at the front edges.

Consider color coordination by grouping plants with harmonious hues, or create contrast with bold color pairings. Leave adequate space between plants to prevent overcrowding and promote air circulation. Incorporate a mix of textures—feathery foliage paired with broad leaves adds visual interest.

For optimal care, use well-draining soil amended with organic matter, and water deeply but infrequently to encourage strong root systems. Mulching helps retain moisture and suppress weeds. Rotate the plant box occasionally to ensure even sunlight exposure.

By combining practical spacing with artistic design, your heritage plant box will become a thriving, beautiful centerpiece in your garden.