Green Grass Grove
Connecting specimen records, habitat data, and the living archive.
Kohlrabi / Purple Vienna
Brassica oleracea L. (Gongylodes Group)Kohlrabi / Purple Vienna is maintained in 3G-GroveOS as a distinct Green Grass Grove crop and living-collection record, not as a generic root-vegetable placeholder. The profile connects identity, propagation material, seasonal timing, underground development, pest scouting, harvest quality, and Florida protection decisions. At the Live Oak property, performance should be compared across sandy soil, amended raised beds, containers, and protected nursery starts where appropriate. The…
Botanical Overview
Kohlrabi / Purple Vienna is maintained in 3G-GroveOS as a distinct Green Grass Grove crop and living-collection record, not as a generic root-vegetable placeholder. The profile connects identity, propagation material, seasonal timing, underground development, pest scouting, harvest quality, and Florida protection decisions. At the Live Oak property, performance should be compared across sandy soil, amended raised beds, containers, and protected nursery starts where appropriate. The record is designed for food production, accession preservation, public education, and long-term local observations. Cultivar claims are limited to the identity supported by the existing record.
Why We Feature This Specimen
From the first labeled propagule to the final harvest record, Kohlrabi / Purple Vienna offers Green Grass Grove a hands-on study in how climate, soil structure, water, and genetics shape an underground crop. Visitors and Myco-Patrons can compare visible canopy growth with the hidden storage organ developing below, while nursery records preserve the identity and source of every line. The profile supports demonstration beds, seed or propagule conservation, scouting education, and practical food production without flattening the crop into generic garden copy.
Climate & Protection
Cold protection trigger: Begin cold protection below 38 °F. The cold-damage threshold is the lower temperature where injury becomes likely, not the recommended waiting point.
Sun / Light: Full sun for maximum underground yield; light afternoon shade may reduce late-season heat stress for cool-season crops.
Kohlrabi / Purple Vienna should be scheduled by seasonal temperature and crop stage rather than USDA hardiness zone. At Green Grass Grove, use the crop's stated planting window, frost response, soil temperature, and harvest interval; the zone field is retained as an annual-production explanation rather than a cultivar hardiness claim. Spring heat accelerates woodiness and splitting. Harvest when stems are about 2–3 inches across rather than waiting for maximum size.
Heat-zone and verification notes
Not assigned; use seasonal temperature guidance rather than AHS heat-zone claims.
Planting & Seasonal Guide
Starting & Germination Methods
Seed Sowing
Seed sowing is the umbrella operational method for placing botanical seed into a germination environment. It includes selection of containers or beds, medium, depth, spacing, moisture, temperature, light,…
Open Full Method ↗Direct Sowing
Direct sowing is the establishment of plants by sowing seed outdoors or into the final production bed rather than transplanting nursery-grown seedlings. It is a complete site operation…
Open Full Method ↗Indoor Seed Starting
Indoor seed starting produces transplants in containers under managed temperature, light, moisture, sanitation, and spacing before outdoor or greenhouse establishment. It extends the production season, protects valuable seed,…
Open Full Method ↗Direct sow or transplant during fall through winter. Maintain steady growth because heat, crowding, or drought produces woody stems.
Spacing: Space 6–8 inches apart for full-size stems, with 12–18 inches between rows.
Planting Depth: Space 6–8 inches apart for full-size stems, with 12–18 inches between rows.
Pollination: Pollination is unnecessary for the harvested vegetative organ of Kohlrabi / Purple Vienna. For seed saving, preserve the cultivar or accession identity, account for biennial or self-incompatibility behavior where relevant, and isolate from compatible flowering crops.
Water, Soil & Nutrition
💧 Water & Moisture
Maintain a fine, evenly moist seedbed until Kohlrabi / Purple Vienna emerges, then irrigate deeply enough to keep roots growing without creating saturated soil. Crusting after heavy rain can prevent emergence, especially in direct-seeded root crops, so use light irrigation, surface mulch compatible with tiny seedlings, or temporary shade fabric when needed. Uneven moisture can cause cracking, pithiness, forking, bitterness, or premature bolting depending on the crop. Drip or low-angle irrigation reduces soil splash and leaf-wetness disease. Pause irrigation during prolonged North Florida rain and inspect raised beds for perched water.
Even moisture with high root-zone oxygen; avoid drought-to-saturation cycles.
Humidity is not usually the primary limitation for Kohlrabi / Purple Vienna, but prolonged leaf wetness and saturated soil increase foliar disease and root-decay risk. Space rows for air movement, irrigate early, and remove diseased debris promptly. After fog, heavy dew, or tropical rain, inspect the crown and soil line rather than assuming yellowing is a nutrient problem. Dense foliage should not remain compressed against neighboring crops or container walls. Record disease incidence by planting date because late warm plantings usually carry greater humidity pressure.
🌱 Soil & Growing Media
Preferred pH: 6.00 to 7.20
↘ Drainage & Root-Zone Behavior
✦ Nutrition & Deficiency Checks
Kohlrabi / Purple Vienna requires steady but not excessive fertility. Use soil testing and split nitrogen on Florida sand so rapid leaching does not alternate with overfeeding. Too much nitrogen can produce large tops, delayed root or stem enlargement, nitrate accumulation, and weaker storage quality. Boron and other micronutrient disorders can mimic disease in some root crops, while high pH can restrict iron and manganese. Confirm suspected deficiencies with soil pH, root inspection, and crop-specific tissue guidance before adding micronutrients.
Pithiness, woodiness, splitting, excessive pungency, and bolting are primarily timing and moisture problems. Root maggot injury, wireworm holes, clubroot, or root-knot nematodes can distort underground portions. Flea beetles and caterpillars may reduce leaf area before roots size. Hollow or soft tissue after rain can indicate rapid growth followed by decay. Harvest promptly at the crop-specific size instead of using maximum age as the goal.
Growth, Maintenance & Harvest
Maintenance & Pruning
Remove damaged or diseased foliage from Kohlrabi / Purple Vienna with clean tools, but retain enough canopy to support underground development. For vines or tall stems, redirect or support growth rather than repeatedly cutting healthy foliage. Remove flower stalks when the goal is root or stem harvest, except on designated seed plants. After frost or natural senescence, cut dead tops before lifting storage organs. Sanitize tools between accessions.
Harvest or Observation
Harvest Purple Vienna kohlrabi when the swollen stem is about 2–3 inches across and still tender. Cut the stem at soil level, remove large leaves, and cool promptly. Oversized stems often become fibrous even when the skin remains attractive. Young leaves are edible and can be handled as cooking greens. Record stem diameter and texture to define the best Green Grass Grove harvest standard.
Storage & Preservation
Harvest Purple Vienna kohlrabi when the swollen stem is about 2–3 inches across and still tender. Cut the stem at soil level, remove large leaves, and cool promptly. Oversized stems often become fibrous even when the skin remains attractive. Young leaves are edible and can be handled as cooking greens. Record stem diameter and texture to define the best Green Grass Grove harvest standard.
Harvestable Plant Parts & Uses
Harvest Purple Vienna kohlrabi when the swollen stem is about 2–3 inches across and still tender. Cut the stem at soil level, remove large leaves, and cool promptly. Oversized stems often become fibrous even when the skin remains attractive. Young leaves are edible and can be handled as cooking greens. Record stem diameter and texture to define the best Green Grass Grove harvest standard.
Propagation, Cloning & Tissue Culture
Propagation Methods
Direct Sowing
Direct sowing is the establishment of plants by sowing seed outdoors or into the final production bed rather than transplanting nursery-grown seedlings. It is a complete site operation…
Open Full Method ↗Seed
Seed is retained as an umbrella propagation identity for sexual reproduction through mature botanical seed. A seed normally contains an embryo, stored reserves or nutritive tissue, and protective…
Open Full Method ↗Transplant
Transplant is a nursery handling process that moves an established seedling, rooted cutting, division, grafted plant, or tissue-culture plantlet from one container or site to another. It is…
Open Full Method ↗Aquaponics, Hydroponics & Aeroponics
Aquaponics
Kohlrabi / Purple Vienna is rated suitable for aquaponics because the edible organ requires substantial root volume, oxygen, and harvest access. Small research trials may be possible in deep, well-aerated media beds, but conventional raft or NFT channels are generally unsuitable for large underground organs. Track root deformation, oxygen, sanitation, and system disturbance during harvest.
Hydroponics
- Target pH5.8–6.5
- Target EC1.8–2.4
Kohlrabi / Purple Vienna is rated suitable for hydroponics. Use a deep, opaque, strongly aerated root zone or substrate system and avoid treating the crop like a shallow leafy green. The suggested pH and EC are crop-group starting ranges that require water analysis and local trials. No universal stage-specific N-P-K ratio is supplied because formulation depends on water, substrate, cultivar, and tissue analysis.
Aeroponics
Aeroponic production of Kohlrabi / Purple Vienna is experimental for Green Grass Grove. It may allow inspection of developing roots or tubers, but support, darkness, mist reliability, sanitation, and organ space are limiting. Use only a contained research unit with backup irrigation.
Pests, Diseases, Safety & Toxicology
Scout Kohlrabi / Purple Vienna for aphids, flea beetles, caterpillars, root maggots, wireworms, nematodes, rodents, and crop-specific foliage or root feeders. Diagnose damage before treatment.
Monitor Kohlrabi / Purple Vienna for damping-off, leaf spots, foliar mildews, root and crown rots, vascular wilts, and storage decay. Rotate crops, improve drainage, and harvest without injury.
Maintain Kohlrabi / Purple Vienna in friable, well-prepared soil with even moisture, prevent weed competition, preserve the approved cultivar or market-class label, and harvest at crop-specific maturity before quality declines.
Pithiness, woodiness, splitting, excessive pungency, and bolting are primarily timing and moisture problems. Root maggot injury, wireworm holes, clubroot, or root-knot nematodes can distort underground portions. Flea beetles and caterpillars may reduce leaf area before roots size. Hollow or soft tissue after rain can indicate rapid growth followed by decay. Harvest promptly at the crop-specific size instead of using maximum age as the goal.
Kohlrabi is a normal Brassica food crop. Glucosinolates and nitrate accumulation are relevant mainly to unusually large raw intake or overfertilized low-light crops.
Kohlrabi is a normal Brassica food crop. Glucosinolates and nitrate accumulation are relevant mainly to unusually large raw intake or overfertilized low-light crops. Wash harvested produce, segregate treated plots, and observe all pesticide-label preharvest intervals.