Root Vegetables – Carrots, Radishes, Parsley, Celery, Beets

Root vegetables form the foundation of the Czech garden and kitchen. Carrots, parsley and celery are an indispensable part of every good soup, radishes reliably announce the arrival of spring, and red beets are making a comeback as a nutritional superhero full of iron, betaine and antioxidants. Most of these crops are undemanding, store well, and will provide you with harvests from the first spring sowings through autumn harvest for storage. This guide covers six of the most commonly grown varieties in detail – carrots, radishes, parsley, celery, beets and kohlrabi – with specific procedures tailored to Czech conditions.

Common Reference Table – Quick Overview

1. Carrot (Daucus carota)

Carrot is the most widespread root vegetable in the Czech Republic and at the same time one of the most versatile – excellent raw, cooked, in soups and juices, and surprisingly also in cakes and desserts.

Varieties and Cultivars

• Early (Nantes type): Cylindrical, sweet, finely textured roots. Cultivars: Nantes, Rothild, Rote Riesen. Harvest in 70–90 days.
• Mid-season (Berlicum type): Longer, uniform roots with excellent storability. Cultivars: Berlicum, Berlikumer. Harvest in 90–110 days.
• Late (Flakkee type): Robust roots intended for winter storage. Cultivars: Flakkee, Autumn King. Harvest in 110–130 days.
• Mini and round: Suitable for containers and heavy soils where classic carrots would fork. Cultivars: Pariser Markt (round), Adelaide (mini).

Sowing

When: From mid-March (as soon as soil can be worked) through mid-June. June sowings are intended exclusively for autumn harvest and winter storage.

How:
1. Work the soil to a depth of 25–30 cm and carefully remove stones and larger clods – any obstacle deforms the growing root.
2. Sow into furrows 1–1.5 cm deep, spacing between rows 25–30 cm.
3. Mix the fine carrot seeds with sand in a 1:3 ratio – significantly facilitates even sowing and saves thinning work.
4. Cover with fine soil and press lightly for good seed-to-soil contact.
5. Germination takes 14–21 days – be patient. Keep the bed uniformly moist throughout, otherwise you'll unnecessarily prolong germination.

Care

• Thinning: Once seedlings have 3–4 true leaves, thin to final spacing of 3–5 cm. Dense stands produce thin, underdeveloped roots without flavor.
• Weeding: In the first weeks, carrots grow very slowly and are easily overrun by weeds. Weed carefully and shallowly to avoid damaging still-rooting seedlings.
• Watering: Regular but moderate. Waterlogged soil leads to rot; conversely, irregular watering – alternating dry and excessive moisture – causes root cracking.
• Fertilizing: Carrots are less nutrient-demanding than fruiting vegetables. Never use fresh manure – it causes forking and root deformities. Ideal is to work mature compost into the soil in the previous autumn, or use fertilizer with a low nitrogen content.

Diseases and Pests

• Carrot rust fly (Psila rosae): The most feared pest. Larvae tunnel through the root, rendering it worthless. Prevention: strict crop rotation, later sowing (after the first fly generation passes in May), covering with non-woven fabric immediately after sowing, and intercropping with onions, which repel the fly.
• Alternaria leaf spot: Dark necrotic spots on leaves. Solved by crop rotation and choice of healthy certified seed.

Harvest and Storage

• Thin early cultivars beginning in June. Late storage cultivars should be pulled in October before hard frosts occur.
• After pulling, let roots dry briefly and trim foliage to 2 cm – a shorter stub would increase rot risk.
• Storage: In a cool cellar buried in sand or slightly moist peat, temperature 1–5 °C, relative humidity 90–95%. Properly stored carrots keep 5–6 months.

2. Radish (Raphanus sativus)

Radish is the quickest vegetable in the garden – from sowing to harvest takes only 3–5 weeks. It's therefore ideal for beginners, children and anyone wanting quick results.

Varieties and Cultivars

• Round red: Proven classic. Cultivars: Saxa, Cherry Belle, Rudolf.
• Cylindrical: Elongated shape, finer flavor, less pungent. Cultivars: French Breakfast (red-white), Icicle (white).
• Summer and fall: Larger, slower, more heat-tolerant. Cultivars: Münchner Bier (large white, popular in Bavaria).

Sowing

When: March through September. During the hottest weeks (typically July and early August), radishes bolt quickly in heat, roots become woody and lose flavor – skip sowing in this period.

How:
1. Sow directly on the bed into furrows 1 cm deep.
2. Spacing: 3–5 cm in the row, 15–20 cm between rows.
3. Germination: 3–7 days – one of the fastest-sprouting vegetables.
4. Sow in batches every 2 weeks – ensures uninterrupted harvest throughout the season.

Care

• Regular watering is essential – gaps in watering lead to woodiness and hollow roots.
• Fertilizing is practically unnecessary. Radishes grow so fast that residual nutrients from the previous crop suffice.
• The most common pest is flea beetles – small jumping insects that perforate leaves. Reliable prevention is covering with non-woven fabric immediately after sowing.

Harvest

Harvest as soon as roots reach appropriate size – never allow them to overgrow. Oversized radishes are hollow, woody, pungent and indigestible. Optimal diameter for round cultivars is 2–3 cm.

3. Root Parsley (Petroselinum crispum var. tuberosum)

Root parsley is an indispensable part of Czech cuisine – no good broth exists without it. Growing requires patience, because parsley germinates slower than any other root herb, and nearly half a year passes before harvest.

Cultivars

• Olomouc Long: Czech breeding classic, straight smooth roots. Reliable yield and excellent flavor.
• Haná: Straight uniform roots, excellent storability, preferred by professional growers.
• Berlin: Medium-length, suitable even for heavy and less permeable soils.
• Leaf Parsley: Grown exclusively for aromatic foliage, doesn't form a root. Cultivars: Mooskrause (curly), Gigante d'Italia (smooth-leaf with intense aroma).

Sowing

When: March through mid-April. Parsley needs 140–180 days of growing season, so don't delay sowing.

How:
1. Sow into furrows 1.5–2 cm deep, spacing between rows 25–30 cm.
2. Germination is extremely slow – expect 21–35 days. The bed will be overrun by weeds in the meantime unless you secure it.
3. Proven tip: Sow parsley together with radish in the same row. Radishes emerge in a week, clearly mark the row, allow first weeding – and by the time parsley needs space, radishes are long harvested.
4. Soak seeds 24 hours in lukewarm water before sowing – slightly accelerates germination and improves viability.

Care

• After emergence, thin to final spacing of 5–8 cm.
• Weed thoroughly, especially in the first weeks – parsley's slow germination and growth disadvantage it against weeds.
• Watering: regular, moderate.
• Fertilizing: undemanding crop; excess nitrogen leads to root forking, just like with carrots.

Harvest and Storage

• Harvest from September through November, before hard frosts arrive.
• Light autumn ground frosts don't harm parsley – it can be left in the garden and harvested gradually through November.
• Storage: identical principle as carrots – store in sand in a cool cellar (1–5 °C).

4. Celeriac (Apium graveolens var. rapaceum)

Celery is the most demanding root vegetable to grow – it requires presowing, has the longest growing season (180–200 days), and is sensitive to temperature fluctuations. Those who give it necessary care will harvest aromatic, large bulbs, without which no autumn soup deserves its name.

Cultivars

• Diamant: Smooth, regular bulb with minimal side roots. Most popular cultivar in the Czech Republic for home growing and market production.
• Monarch: Exceptionally large bulbs, store excellently.
• Prince: Early compact cultivar, suitable where growing season is shorter.
• Celery Leaf (var. dulce): Entirely different type – grown for fleshy stalks, not bulbs. This guide covers celeriac exclusively.

Presowing

Celery must be presown – outdoor direct sowing isn't realistic in Czech conditions due to too short a growing season.

1. Sowing: February through early March into trays with fine, well-draining substrate.
2. Sowing depth: Celery seeds are tiny and need light to germinate – don't cover with soil, just press gently with a finger or board to the surface.
3. Germination temperature: 18–22 °C. Germination takes 14–21 days.
4. Potting on: Once seedlings develop 2–3 true leaves, pot into 8–10 cm pots.
5. Outdoor transplanting: After final frosts – that is, after the ice saints, typically from mid-May. Spacing 30–40 cm.

Critical warning: Celery is extremely sensitive to cold at early developmental stages. If seedlings are exposed to temperatures below 10 °C for more than 10 days, vernalization may occur – the plant bolts prematurely instead of forming bulbs. Carefully harden off seedlings before transplanting.

Care

• Watering: Regular and generous. Celery requires consistently moist soil – short dry periods lead to woody and hollow bulbs.
• Fertilizing: Celery is a heavy feeder. Apply fertilizer regularly with balanced fertilizer, nettle brew or compost tea. The plant has elevated potassium and boron requirements – deficiency causes browning of the bulb interior.
• Removing side roots: Through summer remove side rootlets growing on the upper bulb surface – the result is a smoother, cleaner bulb with better market and culinary value.
• Bulb position: Celery bulbs properly grow above soil level, not in it. Don't mound soil around them.

Harvest and Storage

• Harvest: October, before hard frosts arrive.
• Trim roots and foliage (leave a 3–4 cm stub of foliage).
• Storage: store in sand in a cool cellar (1–5 °C). Keeps 3–5 months.

5. Red Beet (Beta vulgaris)

Red beet is experiencing a well-deserved rediscovery. Thanks to high iron, folic acid, betaine and natural antioxidant content, it ranks among the most nutritionally valuable vegetables. Growing it is something any beginner can manage.

Cultivars

• Detroit Dark Red: Proven classic – round, dark crimson, uniform growth and flavor.
• Chioggia (Bassano): Italian cultivar with striking white and red concentric rings in cross-section. Attractive in salads; rings fade with heat.
• Cylindra: Cylindrical shape ensures uniform slices ideal for pickling and sterilization.
• Golden: Yellow cultivar that doesn't stain hands or cutting board. Sweeter and finer flavor than red cultivars.
• Boltardy: Resistant to premature bolting – ideal choice for early April sowings.

Sowing

When: April through June. Beet tolerates mild cold, but too early sowing in cool March increases risk of unwanted vernalization and bolting.

How:
1. Direct sowing on the bed. Depth 2–3 cm, spacing between rows 30 cm.
2. What looks like beet "seed" is actually a "cluster" containing 2–4 true seeds. After emergence always thin to final spacing 10–15 cm – without thinning you'll get only dense foliage and miniature bulbs.
3. Germination: 7–14 days.
4. Soaking seeds 12 hours in lukewarm water before sowing reliably speeds up and evens out germination.

Care

• Watering: Regular and moderate. Beet tolerates short dry periods better than carrots, but with regular watering bulbs are noticeably juicier and tastier.
• Fertilizing: Moderate demands. Soil enriched with compost before sowing usually needs no additional fertilizing. Beware excess nitrogen – it leads to lush but empty foliage at the expense of bulbs and increases nitrate accumulation.
• Weeding: Important in early stages; once beet develops foliage, it suppresses weeds itself with its robust leaf rosette.

Harvest and Processing

• Harvest: 60–90 days from sowing. Young bulbs 5–7 cm diameter are most flavorful.
• Bulbs over 10 cm diameter tend to be woody, tough and bland – process immediately rather than store.
• When pulling, trim foliage to 3–5 cm – too short a stub causes "bleeding" and loss of color and nutrients when cooking.
• Storage: In a root cellar in sand at 1–5 °C keeps 3–4 months.
• Culinary use: Roasted beet (tastiest preparation method, caramelizes natural sugars), boiled, fermented (kvass, sour beet), in salads and carpaccio, pressed juice, borscht.

6. Kohlrabi (Brassica oleracea var. gongylodes)

Kohlrabi belongs to the root vegetable group more by tradition than botany – the edible part is actually a thickened stem, not a root. Yet it has a firm and well-deserved place in the Czech garden: it grows quickly, stores well, and offers pleasantly tender, mildly sweet flavor reminiscent of cabbage and peach combined.

Cultivars

• White: Luna, Lannro, Konan F1. Rapid growth, fine flavor, suitable for spring and summer sowing.
• Blue (Purple): Blankyt, Violeta. Visually attractive, somewhat firmer flesh, better storage than white.
• Giant: Superschmelz – can reach over 5 kg and still maintain flesh tenderness. Curious cultivar, but fully functional and tasty.

Sowing and Transplanting

Kohlrabi is most often presown and transplanted as seedlings.

Presowing:
1. Sow into trays: March for spring harvest, June for autumn.
2. Depth: 1 cm. Germination temperature: 15–20 °C. Germination: 5–10 days.
3. Pot on into individual pots.
4. Transplant outdoors: from April (tolerates light ground frosts). Spacing 25–30 cm.

Direct sowing: Possible from April, but presowing offers more even and reliable results.

Kohlrabi can easily be grown in three waves per season – spring, summer and fall transplanting – ensuring continuous supply of fresh produce.

Care

• Watering: Regular and even. Moisture fluctuations cause woodiness and bulb cracking.
• Fertilizing: Moderate demands. Compost worked in before transplanting combined with light fertilizing during growth suffices completely.
• Mulching: A thin mulch layer maintains even soil moisture and reduces weeding – clearly recommended for kohlrabi.

Harvest

• Harvest at bulb diameter of 6–8 cm (white cultivars) or 8–10 cm (blue cultivars). Oversized kohlrabi rapidly becomes woody and practically unusable.
• Superschmelz is an exception – this cultivar grows slowly and maintains tenderness even at significantly larger sizes.
• From transplanting to harvest: 50–70 days.

Storage

• Fresh kohlrabi without foliage keeps in refrigerator in a perforated bag 2–3 weeks.
• Blue cultivars tolerate root cellar storage 1–2 months.

7. General Principles for Root Vegetables

Soil

Root vegetables generally require deep, loose, well-draining soil free of stones and hard clods. Any obstacle in the soil profile – stones, compacted layers, overgrown debris – causes root forking and deformity, especially with carrots and parsley.

Before the season begins, thoroughly loosen soil to a depth of 25–35 cm. Improve heavy clay soil by incorporating sand and mature compost. Raised beds are an ideal solution for root vegetables – they offer naturally loose structure, better drainage, and faster warming in spring.

Crop Rotation

Maintain strict crop rotation – never grow the same crop or crops from the same family in the same place more than once every 3–4 years:

• Apiaceae (carrots, parsley, celery, parsnip) regularly rotate with crops from other families.
• Brassicaceae (radish, kohlrabi, cabbage) share a common soil pest – clubroot (Plasmodiophora brassicae); failure to rotate quickly compounds the problem.
• Beet is the most flexible – tolerates most previous crops.

Fertilizing – General

Root vegetables (except celery) are typically less nutrient-demanding than fruiting vegetables. Fresh manure directly harms carrots and parsley – it causes forked roots and worsens storage quality. The recommended strategy is growing root vegetables in the second year after fertilizing – on the site where demanding plants like tomatoes, cucumbers or cabbage grew the previous year.

For basic nutrition of most root vegetables, mature compost worked in in autumn or early spring suffices. Any supplemental feeding during the season should be moderate, using balanced fertilizer without excess nitrogen.

Pest Protection

Most effective and simplest protective measures for root vegetables:

1. Non-woven fabric – physical barrier reliably prevents carrot rust fly, flea beetles and aphids. Place immediately after sowing and maintain throughout the risk period.
2. Intercropping: Combine carrots with onion or leek – they mutually repel characteristic pests. Plant radishes as an intercrop among lettuce or carrots.
3. Crop rotation: Systematic rotation prevents pathogen and pest egg accumulation in soil.
4. Healthy seed: Purchase certified root vegetable seed from trusted suppliers.