French marigold: Sowing, planting and harvest calendar

Sow French marigolds (Tagetes patula) under cover in spring, adjusting the date to your climate and planned planting time. Use small pots with drainage holes or a seed tray filled with well-drained seed compost.

Lightly moisten the compost, distribute the seeds and cover them at the depth indicated on the packet. Place the containers somewhere warm and bright. Keep the compost moist without waterlogging it; emergence time depends on temperature and conditions.

Once young plants have several leaves and are sufficiently developed, you can transplant them into larger pots. Before planting in the garden, gradually acclimatise them to outdoor conditions and wait until the risk of frost has passed. Choose a sunny position and well-drained soil, with spacing suited to the variety.

Label the sowing with the botanical name to distinguish these Tagetes from pot marigolds. If sowing in a tray, distribute seeds without crowding them to make transplanting easier. Later, handle seedlings by supporting their root balls rather than squeezing fragile stems. Ventilate covered sowings after emergence and empty saucers: warmth and light do not mean the roots should sit in water.

Sow French marigolds (Tagetes patula) directly outdoors after the last frosts, once the soil has warmed sufficiently. Choose a sunny position and well-drained soil. Weed and prepare a fine, level surface.

Sow at the depth indicated on the packet and cover the seeds. Adjust spacing to the variety, then thin out overcrowded seedlings; about 20–30 cm may suit compact forms. Water gently and keep the soil moist without waterlogging it during emergence.

Marigolds generally need little feeding, but requirements depend on the soil and growing conditions. Avoid excessive fertiliser. Watch for pests and encourage their natural predators before choosing a suitable intervention.

Mark the row or small sown patches so you do not weed them away by mistake. A densely sown edging will need thinning to give plants room to branch. Remove surplus seedlings without lifting their neighbours' roots, then water gently. Watch particularly for slugs around young leaves after wet weather. Keep Tagetes and pot marigold seed packets separate, as their suitable sowing times may differ.

Plant French marigolds in the vegetable garden after the last frosts, once the soil has warmed. Mid-May can be a guide in some temperate regions, but adjust the date to your climate and weather. Gradually acclimatise plants raised under cover to outdoor conditions.

Choose a sunny position and loosened, well-drained soil. Adjust spacing to the variety; about 20–30 cm may suit compact forms. Plant without damaging the roots and water after planting, then as needed.

Marigolds add colour between vegetables and can flower until the first frosts. Remove faded flowers to encourage new blooms and check young plants for any pest damage.

French marigolds generally flower in summer and can continue until the first frosts, depending on the variety, sowing date and climate. Their single or double flowers are yellow, orange, red or a mixture of colours.

Grow them in sun and well-drained soil. Water as needed to prevent young plants and pots from drying out, without keeping the soil waterlogged. Avoid excessive fertiliser, which can encourage leaves at the expense of flowers.

Pinching out young shoots can encourage branching; this should not be confused with repeatedly cutting flowering stems. Remove faded flowers to encourage new blooms. Marigolds in the vegetable garden do not guarantee protection of every crop against insect pests.

Remove the whole faded flower head rather than just its petals, without cutting neighbouring buds. After rain, check double flowers, whose tightly packed parts can stay wet and deteriorate. Remove rotting heads and keep tools clean. Watch for new buds to follow the return of flowering, which also depends on the plant's vigour. Leave a few heads to mature only if you want to collect seeds.