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Cauliflower 'Aalsmeer' (Spring) - Seeds

Awarded an RHS Award of Garden Merit

Creamy white heads of a good depth and weight

Outstanding winter hardiness

This product is produced and supplied in association with Thompson & Morgan

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Description Sowing More Info Delivery Reviews

Cauliflower 'Aalsmeer' shows outstanding winter hardiness and produces well-protected, creamy white heads of a good depth and weight. This RHS AGM spring cauliflower matures gradually throughout April which extends the harvesting period throughout the month. Height: 60cm (24"). Spread: 75cm (30").


1 Packet (50 Seeds) (23582)

Sow Cauliflower seed from April to June. Direct sow outdoors into a well prepared seedbed, for transplanting to their final positions later on. Sow at a depth of 1cm (1/2") and distance of 30cm (12") between rows. Cauliflower plants can be transplanted to their final positions approximately 5 weeks from sowing.


Alternatively sow Cauliflower seed indoors at a depth of 1cm (1/2") in trays of free-draining, seed sowing compost and cover with a sprinkling of vermiculite. Place in a propagator or seal container inside a plastic bag at a temperature of 21C (70F) until after germination which takes 4 -7 days. Transplant seedlings into 7.5cm (3") pots and grow Cauliflower plants on in cooler conditions until all risk of frost has passed and plants are large enough to be transplanted outdoors.


Gradually acclimatise Cauliflower plants to outdoor conditions over 7 - 10 days before planting in a sheltered position on firm, rich fertile, well drained soil in full sun. Prepare the soil in early spring by adding plenty of well rotted farmyard manure to the soil to improve its structure and fertility. Apply lime to acid soils to reduce the acidity and lessen the risk of clubroot. Plant cauliflowers at a distance of 25cm (10") between plants each way for 'baby heads', and 60cm (24") apart for larger heads. Cover with a protective netting or fleece to prevent attack from birds and insects. Water the plants thoroughly after planting.

Water cauliflowers regularly and do not allow them to dry out as this may impair their development. Hoe between plants regularly to prevent weeds from establishing and bring insect larvae to the surface. Spring cauliflowers can be harvested in spring when the curds are fully matured, and while they are still tight and firm. Culinary note: Cauliflowers freeze well.

Seeds and garden supplies will normally be delivered within the time period stated against each product as detailed above. Plants, bulbs, corms, tubers, shrubs, trees, potatoes, etc. are delivered at the appropriate time for planting or potting on. Delivery times will be stated on the product page above, or in your order acknowledgement page and email.

Orders for packets of seed incur a delivery charge of £2.99.

Orders which include any other products will incur a delivery charge of £6.99.

Where an order includes both packets of seeds and other products, a maximum delivery charge of £7.99 will apply - regardless of the number of items ordered.

Large items may incur a higher delivery charge - this will be displayed in your shopping basket.

Please see our Delivery page for further details, and more information on different charges that may apply to certain destinations.

For more information on how we send your plants please visit our Helpful Guide on plant sizes.

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