Beetroot is a satisfying vegetable to grow because you can see the roots swelling within a few weeks. It needs little space, works in containers and can be harvested while the roots are still small and sweet. Most disappointing crops come from sowing too thickly, letting seedlings dry out or planting so early that cold weather encourages flowering instead of roots.
In Britain, beetroot is usually sown directly into its final growing position. You can raise early seedlings in modules too, but treat the roots gently when moving them. The method below covers ordinary round beetroot, with notes on small-root crops and autumn storage.
Choose a growing position before opening the seed packet
Beetroot likes a sunny position with fertile soil that drains well. Remove perennial weeds, stones and large clods, then rake the surface until you can make a shallow, even row.
The RHS advises adding well-rotted organic matter when preparing beetroot ground. Garden compost improves the soil structure, but fresh, uncomposted manure immediately around young roots is best avoided. In an established no-dig bed, sow into the prepared surface layer.
When should beetroot be planted in the UK?
Main outdoor sowings usually begin in late March or April when soil conditions are suitable, and can continue through July. The RHS gives a soil temperature of at least 7°C as a guide for spring germination. In a cold northern garden, practical conditions matter more than the date on the packet.
If you want an unusually early crop, select a bolt-resistant variety and use cloches or biodegradable fleece to warm the soil. Some gardeners sow earlier than March, but cold stress can make ordinary varieties send up flowering stems before roots mature.
For a steady kitchen supply, sow a short row every few weeks instead of one enormous row that all becomes ready at once. Late sowings can provide roots for autumn storage.
Understand why one beetroot seed can make several plants
Most ordinary beetroot seed packets contain corky little clusters rather than individual single-plant seeds. One cluster may produce more than one seedling. There are also specially bred monogerm varieties which generally produce fewer seedlings per seed.
This matters when thinning. It isn't always a sign that you accidentally scattered a dozen seeds in one place. Several tiny plants growing from the same cluster can be entirely normal.
Read your packet before sowing, especially for spacing, variety and whether the seed is supplied as a single-germ type. Be prepared to thin crowded seedlings if you want each plant to develop a larger root.
How to sow beetroot straight into the ground
Mark a shallow drill about 2.5cm deep, leaving approximately 30cm between conventional rows. Water along the drill if the soil is dry. Place beetroot seed clusters roughly 10cm apart if you want reasonably sized individual roots.
Cover with soil, gently firm the surface and water if necessary. Add a clear plant label with the variety and date. It saves confusion when other seedlings and weeds begin appearing.
The RHS also describes sowing little groups about 15cm apart to produce clusters of smaller beetroot. This can be useful where space is tight and you intend to lift the roots young.
Keep the soil gently moist while seeds germinate. Don't repeatedly flood the row, and don't let a freshly sown seedbed turn bone-dry for days.
Starting an early crop in modules
For a head start, use a modular seed tray filled with moist, peat-free seed compost. Sow a seed cluster into each module about 2.5cm deep, then keep it somewhere with suitable warmth and good light.
If more than one seedling appears, keep the strongest for an individual-root crop, or grow small clumps if that is your chosen method. Handle the compost plug carefully when planting out.
Transplant when seedlings are young and conditions outside are suitable. Water before moving them, keep the root plug intact and firm it gently into prepared soil.
Growing beetroot in pots and containers
You don't need an allotment to grow beetroot. The RHS recommends a large container at least 40cm wide for a direct-sown pot crop, with drainage holes and peat-free multi-purpose compost.
Choose a variety with rounded roots and avoid cramming too many plants into a shallow decorative bowl. Space seed clusters approximately 10cm apart and cover them by about 2.5cm.
Put the pot in a sunny position. Compost in containers can dry much more quickly than soil in a border, so check the moisture regularly, especially during warm spells.
Thinning seedlings without wasting the whole crop
If several seedlings emerge together, decide whether you want lots of small roots or fewer bigger ones. For larger beetroot, thin when seedlings are a few centimetres tall, leaving healthy plants around 10cm apart.
Snip or carefully remove the weaker seedlings. Avoid dragging out the roots of the plant you want to keep, particularly if they have grown tightly together. Small healthy beetroot leaves can be used in salads if washed properly.
For baby beetroot, you can leave selected small groups together, harvesting young roots before they become crowded. Don't expect every plant in a tight bunch to grow to full size.
Watering and care through the season
Keep beetroot watered during prolonged dry spells, especially when roots are swelling. Erratic moisture can cause uneven growth. A mulch on established plants can help reduce evaporation and suppress weeds, but don't bury tiny seedlings under a thick layer.
Hoe gently between rows while plants are small. Be careful not to damage the developing shoulders of the beetroot or sever the roots with a deep hoe.
Most garden crops do not need constant extra feeding if planted into fertile prepared soil. Where leaves are poor, check moisture, crowding, light and drainage before assuming a deficiency.
Watch for bolting, when a plant sends up a tall flowering stem. Cold-stressed early sowings and some varieties are more prone to it. Once a beetroot has bolted, the root may be disappointing, so consider using its leaves and sowing again.
When to lift the roots
The RHS notes that beetroot may be ready from around 40 days in favourable conditions, often taking closer to 50–60 days. It is better to inspect the roots than rely on an exact number from a packet.
For a tender crop, harvest when roots are approximately 4–7cm across. Loosen the soil with a fork and lift gently. Very large roots can become woody, so pick regularly.
Young leaves are edible too, but leave enough foliage on plants you still want to enlarge; the leaves provide the energy that grows the root.
For storing late crops, lift carefully, remove tops without damaging the root, and keep them in an appropriate cool, frost-free environment. The RHS describes storing dry, undamaged roots in sand, compost or coir in a shed or garage.
Common planting mistakes
A row looks like a dense lawn. Seed clusters may have produced multiple seedlings. Thin according to the root size you want.
Seed has not emerged. Check temperature and moisture before resowing; a cold, saturated seedbed is not ideal.
Roots stay tiny. Crowding, shade, poor soil and bolting are possible explanations. Inspect several plants before changing your routine.
Roots crack or turn woody. Irregular growing conditions and delayed harvesting can reduce quality. Lift smaller roots regularly instead of leaving the entire crop to age in the ground.
Beetroot doesn't require complicated equipment. Sow at a sensible depth, leave room for roots, keep the seedbed moist and harvest while the crop is tender. A few short rows make more sense than one bumper harvest.
Source checked
Sowing times, depth, spacing, module planting, containers and harvesting guidance were checked against the RHS beetroot growing guide.