Beta vulgaris subsp. cicla var. flavescens 'Rainbow Mixed' is a Hardy Biennial grown as an annual or biennial cut-and-come-again vegetable. It belongs to the same species as beetroot and sugar beet — the beet family — and is botanically a leaf beet rather than a true chard, though it is universally grown and sold as chard in the UK. 'Rainbow Mixed' is a blend of several distinctly coloured chard varieties selected to produce the widest possible range of stem colours from a single sowing.

The Colours in the Mix:

Biennial with Annual Behaviour: Rainbow Chard is technically a biennial — in its first year it produces the lush, productive leaf growth that makes it such a valuable kitchen garden crop, and in its second year it runs to seed. In practice, most gardeners treat it as an annual, sowing fresh each spring. However, plants sown in late summer and protected through winter will overwinter in mild gardens and continue producing through to the following spring before bolting — giving a much longer productive window than a single-season annual.

Architectural Garden Value: Few vegetables have the ornamental impact of a well-grown row of Rainbow Chard at peak production. The tall, glossy leaves on vivid coloured stems can reach 50–60cm at maturity and create a bold, tropical-looking display that sits as comfortably in a cottage border between dahlias and salvias as it does in a raised vegetable bed. The dramatic stem colours are at their most vivid in warm, sunny conditions and make outstanding cut material for large, bold floral arrangements — an unexpected bonus from a vegetable crop.

Nutritional Value: Chard is one of the most nutrient-dense leafy vegetables available to the kitchen gardener — exceptionally rich in vitamins K, A, and C, magnesium, potassium, and iron. The coloured stem pigments are anthocyanins and betalains — the same powerful antioxidant compounds found in beetroot and red wine — giving Rainbow Chard genuine nutritional credentials to match its visual drama.

Rainbow Chard is one of the most forgiving and productive vegetables in the kitchen garden — it tolerates a wide range of soils and conditions, germinates reliably, and rewards consistent harvesting with months of lush, colourful growth.

How to Sow:
Sow indoors from February to March for the earliest crops, or direct outdoors from April to July. Each chard "seed" is actually a small cluster of seeds fused together — known as a multigerm seed — meaning that two or three seedlings will typically emerge from each sowing point. Thin to the strongest seedling once established. Sow approximately 2cm deep in drills 35–40cm apart, or in individual pots for indoor sowings. Germination is reliable and typically occurs within 7–14 days. For a continuous supply through winter, make a second sowing in August and protect young plants with fleece or a cold frame as temperatures drop.

Where to Grow:
Rainbow Chard thrives in full sun or partial shade and is highly adaptable to most soil types, preferring moisture-retentive, reasonably fertile ground. It performs well in raised beds, large containers, and growing bags. Unlike spinach, it tolerates summer heat with reasonable resilience — making it a more reliable summer leaf crop in warmer parts of the UK. The stem colours are most vivid and intense in full sun; plants grown in shade tend toward greener, less saturated colouring.

Cut-and-Come-Again Harvesting:
Begin harvesting outer leaves individually when plants reach 15–20cm tall, typically 8–10 weeks after sowing. Remove the outermost leaves by pulling them downward and away from the stem with a gentle twisting motion — this is cleaner and less damaging than cutting. Always leave a minimum of four to five young inner leaves intact to maintain the plant's photosynthetic capacity and speed of regrowth. Harvested this way, a single plant will produce continuous leaves for three to four months. Cook leaves and stems separately — the stems take two to three minutes longer to soften than the leaves and benefit from this head start in the pan.

Overwintering:
Plants established by September will survive most UK winters outdoors, particularly in milder areas. A layer of fleece or a cold frame provides sufficient protection in harder winters and keeps the leaves in far better condition for harvesting. Overwintered plants produce some of their finest, most tender, most colourful growth in early spring — often weeks before any other vegetable in the garden is ready to harvest.

Rainbow Chard is arguably the most design-conscious vegetable in the kitchen garden — its stem colours are bold enough to anchor a planting scheme, and these companions from our range make the most of the space around it while benefiting the crop:

• 🧡 Calendula 'Art Shades Mixed': The Potager Masterpiece. The warm apricot, cream, and amber tones of Art Shades Calendula alongside the scarlet, gold, and orange stems of Rainbow Chard is one of the most naturally beautiful and coherent colour combinations in the edible garden — a warm, glowing palette that peaks in late summer and holds into October with remarkable consistency. Calendula's companion benefits are equally valuable alongside chard: its roots deter soil pests, its flowers sustain aphid-eating hoverflies throughout the season, and its fully edible blooms make an outstanding garnish scattered over a warm chard and feta salad. The visual and culinary case for growing these two plants together is overwhelming.
• 🌼 Borage: The Colour Contrast. The electric blue of Borage flowers against the warm, jewelled stems of Rainbow Chard is one of the most striking colour contrasts in the productive garden — cool and warm, rough-textured and glossy, low and tall, playing against each other in a way that looks entirely intentional. Beyond the aesthetics, Borage draws beneficial insects to the chard bed throughout the summer and its deep taproot improves soil structure for the chard's fibrous roots. The edible blue flowers make a beautiful garnish alongside the coloured chard stems on a summer plate.
• 🌼 Nasturtium 'Tom Thumb': The Edible Foreground. The compact mounds of Tom Thumb Nasturtium make an ideal low-growing edging to a Rainbow Chard bed — their vivid orange and red flowers echoing and extending the warm stem palette of the chard at ground level while their peppery foliage deters the blackfly and leaf miners that can damage chard foliage. The trap-crop role of Nasturtiums is particularly valuable here, drawing pest pressure away from the more productive chard plants. All three plants harvested together — Nasturtium flowers, chard leaves, and Calendula petals — make one of the most vibrantly coloured and complex-flavoured salad bowls the kitchen garden can produce.
• 🌿 Basil Classic Italian: The Mediterranean Kitchen Garden. Basil and chard are natural companions in both the Italian kitchen garden tradition and on the plate — both are warm-season crops that peak simultaneously in midsummer, and both thrive in full sun with consistent moisture. Basil's aromatic oils are believed to deter the aphids and leaf miners that target chard foliage, and the culinary partnership is outstanding: chard braised with garlic, olive oil, chilli, and torn fresh basil is one of the great simple Italian vegetable dishes, and growing the two together means the ingredients are always ready at exactly the same time.

Sow indoors from February or direct outdoors from April — then harvest cut-and-come-again from June right through to the first hard frosts, and beyond if plants are given a little winter protection.