RadishRaphanus sativus

Radish

Radishes

1. Raphanus sativus var. sativus

1. Radish

1. Radish
2. Raphanus sativus

1. Tracheophytes
2. Angiosperms
3. Eudicots
4. Rosids

Mustard family

1. Raphanus sativus var. sativus
2. Raphanus sativus var. niger
3. Raphanus sativus var. longipinnatus

1. Root
2. Leaves

Radishes (Raphanus sativus) are popular, fast-growing root vegetables prized for their pungent, slightly peppery flavor and crisp texture. They are excellent for cultivation in small gardens, on balconies, and in raised beds. With a short cultivation period of only 3-6 weeks, they allow for continuous harvesting through successive sowing from spring to autumn. Radishes prefer a sunny to partial shade location with loose, humus-rich, and well-draining soil. Consistent moisture is crucial for developing fast, pungent roots. They are light feeders and do not require intensive fertilization. Ensure good crop rotation to prevent diseases like clubroot and protect against pests such as flea beetles. Harvest when the roots reach the desired size.

1. TaskSow outdoors

   Label

   Sow outdoors

   Priorityhigh

   Months

   1. 3

   ConditionSoil workable

   Estimated effortlow

   Notes

   As soon as the soil can be worked.

2. TaskPrepare soil

   Label

   Prepare soil

   Prioritymedium

   Months

   1. 3

   Estimated effortlow

   Notes

   Loosen the soil and remove weeds.

1. TaskWater

   Label

   Water

   Priorityhigh

   Months

   1. 4
   2. 5
   3. 6
   4. 7
   5. 8
   6. 9

   ConditionDry weather

   Estimated effortlow

   Notes

   Especially important during dry spells to prevent woody and pungent radishes.

2. TaskThin seedlings

   Label

   Thin seedlings

   Prioritymedium

   Months

   1. 4

   ConditionSeedlings too dense

   Estimated effortlow

   Notes

   If sowing was too dense, to ensure optimal growing conditions.

3. TaskSuccession sowing

   Label

   Succession sowing

   Priorityhigh

   Months

   1. 4
   2. 5
   3. 6
   4. 7
   5. 8
   6. 9

   Estimated effortlow

   Notes

   Every 2-3 weeks for a continuous harvest.

1. TaskWater

   Label

   Water

   Priorityhigh

   Months

   1. 4
   2. 5
   3. 6
   4. 7
   5. 8
   6. 9

   ConditionDry weather

   Estimated effortlow

   Notes

   Especially important during dry spells to prevent woody and pungent radishes.

2. TaskSuccession sowing

   Label

   Succession sowing

   Priorityhigh

   Months

   1. 4
   2. 5
   3. 6
   4. 7
   5. 8
   6. 9

   Estimated effortlow

   Notes

   Every 2-3 weeks for a continuous harvest.

1. TaskWater

   Label

   Water

   Priorityhigh

   Months

   1. 4
   2. 5
   3. 6
   4. 7
   5. 8
   6. 9

   ConditionDry weather

   Estimated effortlow

   Notes

   Especially important during dry spells to prevent woody and pungent radishes.

2. TaskSuccession sowing

   Label

   Succession sowing

   Priorityhigh

   Months

   1. 4
   2. 5
   3. 6
   4. 7
   5. 8
   6. 9

   Estimated effortlow

   Notes

   Every 2-3 weeks for a continuous harvest.

1. TaskWater

   Label

   Water

   Priorityhigh

   Months

   1. 4
   2. 5
   3. 6
   4. 7
   5. 8
   6. 9

   ConditionDry weather

   Estimated effortlow

   Notes

   Especially important during dry spells to prevent woody and pungent radishes.

2. TaskSuccession sowing

   Label

   Succession sowing

   Priorityhigh

   Months

   1. 4
   2. 5
   3. 6
   4. 7
   5. 8
   6. 9

   Estimated effortlow

   Notes

   Every 2-3 weeks for a continuous harvest.

1. TaskWater

   Label

   Water

   Priorityhigh

   Months

   1. 4
   2. 5
   3. 6
   4. 7
   5. 8
   6. 9

   ConditionDry weather

   Estimated effortlow

   Notes

   Especially important during dry spells to prevent woody and pungent radishes.

2. TaskSuccession sowing

   Label

   Succession sowing

   Priorityhigh

   Months

   1. 4
   2. 5
   3. 6
   4. 7
   5. 8
   6. 9

   Estimated effortlow

   Notes

   Every 2-3 weeks for a continuous harvest.

1. TaskHarvest

   Label

   Harvest

   Priorityhigh

   Months

   1. 4
   2. 5
   3. 6
   4. 7
   5. 8
   6. 9
   7. 10

   ConditionMature

   Estimated effortlow

   Notes

   Approx. 4-6 weeks after sowing. Do not leave in the ground too long.

2. TaskSuccession sowing

   Label

   Succession sowing

   Priorityhigh

   Months

   1. 4
   2. 5
   3. 6
   4. 7
   5. 8
   6. 9

   Estimated effortlow

   Notes

   Every 2-3 weeks for a continuous harvest.

1. TaskHarvest

   Label

   Harvest

   Priorityhigh

   Months

   1. 4
   2. 5
   3. 6
   4. 7
   5. 8
   6. 9
   7. 10

   ConditionMature

   Estimated effortlow

   Notes

   Approx. 4-6 weeks after sowing. Do not leave in the ground too long.

Full sun to partial shade

A sunny location promotes fast growth, while partial shade can be beneficial in hot weather to protect roots from overheating.

No specific wind protection needed, but protection from strong winds can be beneficial.

Humus-rich, loose, well-draining

The soil should be fine-textured and free of stones to allow for good root development. Avoid waterlogging at all costs.

Regularly, especially during dry periods

Evenly, preferably from below to avoid leaf diseases

Consistent moisture is crucial for developing crisp, mild radishes. Dry spells lead to pungent, woody roots.

Radishes are light feeders. Over-fertilization, especially with nitrogen, can lead to rapid growth but poor flavor and short storage life. Pre-planting compost is usually sufficient.

If needed, a balanced liquid fertilizer at a low concentration.

Radishes are well-suited for companion planting and can be used as space fillers between slow-growing vegetables. They are also good for row cropping or small-space gardening.

Radishes belong to the Brassicaceae family. They should not be planted directly after other brassicas. A break of 3-4 years is recommended.

1. Brassicaceae (Cruciferous vegetables)

1. Potassium deficiency
2. Magnesium deficiency

Although radishes are light feeders, deficiencies can occur in very poor soils. Potassium deficiency can lead to poor root development, magnesium deficiency to yellowing leaves.

1. Woodiness and pungency
2. Premature bolting
3. Root rot
4. Poor root development

Woodiness and pungency result from drought, heat, or delayed harvest. Premature bolting is triggered by stress factors like heat, drought, or long days. Root rot is caused by waterlogging.

1. Flea beetles
2. Cabbage root fly
3. Slugs
4. Turnip blossom weevil

1. Clubroot
2. Downy mildew
3. Blackleg

1. Observe crop rotation
2. Variety selection
3. Site selection
4. Consistent watering
5. Soil care
6. Choose disease-resistant varieties
7. Pest monitoring
8. Encourage beneficial insects

Symptoms like leaf damage indicate flea beetles. Swollen, deformed roots are a sign of clubroot. Wilting and yellowing leaves can indicate root rot or nutrient deficiency.

1. Slugclubroot

   Severityhigh

   Conditions

   1. Soil moisture: high
   2. Soil temperature: 15-20°C
   3. Acidic soil (pH < 6.5)

   Affected parts

   1. Roots (swelling, deformation)

   Prevention

   1. Strict crop rotation (min. 4-year break)
   2. Liming to raise pH
   3. Good drainage
   4. Choose resistant varieties
   5. Soil improvement with compost

   Organic control

   1. No direct biological control possible, prevention is key.
2. Slugdowny_mildew

   Severitymedium

   Conditions

   1. High humidity
   2. Cool temperatures (10-18°C)
   3. Poor ventilation

   Affected parts

   1. Leaves (yellowish spots on top, grey mold on underside)

   Prevention

   1. Good ventilation
   2. Avoid overcrowding
   3. Remove infected leaves
   4. Consistent watering (avoid overhead watering)

   Organic control

   1. Plant extracts (e.g., horsetail)
   2. Milk-water mixture (1:10)
3. Slugflea_beetles

   Severityhigh

   Conditions

   1. Dry, warm weather
   2. Early spring
   3. Soil disturbance

   Affected parts

   1. Young leaves (small, round holes)

   Prevention

   1. Row covers
   2. Promote rapid growth (good nutrition and water supply)
   3. Succession sowing
   4. Mulching

   Organic control

   1. Hand-picking
   2. Beneficial insects (e.g., ground beetles)
   3. Plant extracts (e.g., nettle)

1. Symptom

   Small, round holes in the leaves

   Possible causes

   1. flea_beetles

   First checks

   1. Check the leaves for small, jumping beetles.
   2. See if the holes are fresh or already healed.
2. Symptom

   Swollen, deformed roots with galls

   Possible causes

   1. clubroot

   First checks

   1. Check the soil pH.
   2. Ensure no brassicas have been grown in this bed for the last 4 years.
3. Symptom

   Yellowish spots on leaf tops, grey mold on leaf undersides

   Possible causes

   1. downy_mildew

   First checks

   1. Check the weather conditions (damp, cool).
   2. Examine the leaf undersides closely.
4. Symptom

   Roots are woody and radishes are very pungent

   Possible causes

   1. drought_stress
   2. heat_stress
   3. delayed_harvest

   First checks

   1. Check the soil moisture over the past few weeks.
   2. See if the harvest time has been exceeded.

Visual inspection of plant symptoms, considering environmental conditions and recent cultural practices.

1. Magnifying glass for examining pests and leaf lesions

2. Soil pH testing kit

3. Soil moisture meter

Careful observation of symptoms and environmental conditions is crucial for accurate diagnosis. Also consider the planting history of the bed.

1. Germination: 4-10 days
2. Root growth: 4-6 weeks
3. Flowering (if overwintered or bolted): Spring/Summer

Radishes are fast-growing. The time from sowing to harvest is relatively short and highly dependent on variety and weather conditions.

Continuous, depending on sowing time

Approx. 4-6 weeks after sowing

Harvest as soon as the roots reach the desired size. Harvesting too late leads to woody and pungent radishes.

Individual harvest as needed

1. Visible swelling of the root above the soil
2. Size of the root (depending on variety)

Trim the leaves, wash the roots gently, and use or store immediately. Discard any damaged roots.

Short-term

1. Cool and moist

Radishes do not store for long periods. Cool storage is important for extended shelf life.

Cool and moist

1-2 weeks in the refrigerator

1. Pickling
2. Drying (less common)

Radishes are primarily consumed fresh. The leaves can also be utilized.

1. Raw
2. Salads
3. Garnish
4. Soups (leaves)
5. Pesto (leaves)

The peppery leaves are excellent for pesto or as a spicy addition to salads and soups.

Wash, trim the root tip and stem end. Halve or quarter depending on size. Leaves can be used separately.

Fresh, crisp, and slightly peppery. Ideal for sandwiches, in salads, as a raw snack, or for garnish. The leaves are peppery and can be used like spinach.

Pungent, peppery, slightly earthy

1. Root
2. Leaves

No known toxic properties with normal consumption.

Roots and leaves are edible raw.

Radishes are biennials and produce flowers and seeds in their second year. Plants must overwinter or be kept under suitable conditions for seed production.

Select healthy plants, overwinter them, or grow them into their second year, and harvest mature seed pods.

Cross-pollination with other Brassica species is possible. Isolation is required for pure varietal seed.

Dry the seed pods, thresh out the seeds, remove chaff.

Store cool, dry, and dark in well-sealed containers.

2-4

Radishes are prone to crossing with other radish varieties and related species. An isolation distance of at least 500 meters is recommended for pure varietal seed.

Radishes are annual herbaceous plants and not woody. Therefore, details regarding woody varieties, rootstocks, and woody plant pruning/training are not applicable.

Radishes themselves offer little direct food for wildlife, but growing them in companion plantings or as part of a diverse crop rotation can support garden biodiversity.

Early spring: Sow early, cold-tolerant varieties. Main sowing from April onwards, followed by successive sowing every 2-3 weeks. Watch out for flea beetles.

Summer: Continue successive sowing with heat-tolerant varieties. Consistent watering is crucial to prevent bolting and woody roots.

Autumn: Sow autumn varieties in August/September. Harvest until the first frost. Prepare beds after harvest.

Winter: No sowing or harvesting. Soil rests, plan for the next season.