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Dahlia 'Topmix Mixed' brings a compact mix of colours ideal for pots and bedding displays to summer borders and cutting gardens, with bold flowerheads held on sturdy stems. Whether planted in drifts or dotted through mixed beds, the blooms add instant impact and keep coming through the warm months.

Once established, this clump-forming dahlia typically reaches 30–40 cm, producing plenty of long stems for cutting. Regular picking and deadheading encourages a steady succession of flowers from midsummer into autumn.

Start tubers in a frost-free place in spring, or plant outside once the risk of frost has passed. Choose a sunny, sheltered spot in fertile, humus-rich, well-drained soil, and enrich the planting area with compost for best results.

Water during dry spells, especially while buds form, and feed every two to three weeks through the flowering period. Taller plants benefit from discreet staking, and removing faded blooms keeps the plant productive and tidy.

Perfect for borders, patio pots and cutting gardens, dahlias are also pollinator-friendly in single-flowered forms. Lift and store the tubers after the first frosts in colder areas to enjoy an even better display the following year.

Dahlia 'Verrone’s Obsidian' is an orchid-form dahlia with starry, near-black blooms and a bright yellow centre. The open shape gives a modern look in the border and can be easier for pollinators to use than densely double dahlias—ideal for a dramatic cutting garden.

For best results, start tubers in pots from March or April in a frost-free place, then plant out once the risk of frost has passed. Choose full sun and a warm, sheltered position, and mix in plenty of garden compost to improve structure and drainage.

Plant tubers about 10–15cm deep with the ‘eye’ facing upwards, spacing plants roughly 45–60cm apart. Keep the soil evenly moist as shoots develop. If you’re growing taller stems or larger flower heads, add a cane early so support is in place before flowering.

Water deeply in dry weather and feed every two to three weeks through summer with a high-potash fertiliser to encourage buds. Deadhead regularly and cut stems often—removing spent blooms helps direct energy into new flowers, giving you a longer, heavier display.

After the first frosts blacken the foliage, cut stems back and lift the tubers to store somewhere cool, dry and frost-free. In very mild areas you can mulch heavily, but lifting is safest. Replant next spring and you’ll usually see stronger plants each year.

A high-impact mystery dahlia box for borders, pots and cut flowers.

Each box contains at least £60 worth of plants and bulbs for ?19.99. It is already heavily reduced and is excluded from further discount codes or promotions.

Best for

• Big late-summer colour
• Cut flower patches
• Sunny borders and large containers
• Gardeners who enjoy a surprise mix

What might be inside

• Dinnerplate dahlias
• Cactus and decorative dahlias
• Ball dahlias
• Bedding-style dahlias
• Mixed colours and heights

Contents are selected at packing time from remaining good-quality stock, so every box is a genuine mystery selection. You cannot choose exact varieties, but we pack each box with a useful mix and strong value.

Please note: This is not the right box if you need named varieties or a very specific colour scheme.

Planting guidance

Plant in full sun once conditions are warm, either directly into fertile, free-draining soil or started in pots first. Water well while establishing and support taller stems as they grow.