Detailed Temperature Parameters by Growth Stage for Cabbage

Overview

Appropriate temperature management at each growth stage is extremely important for cabbage (Brassica oleracea var. capitata) development. Based on major Japanese agricultural extension materials, academic papers, and reliable international English sources, this report organizes the following temperature-related parameters for each stage: germination/seedling, vegetative growth, heading, flowering, and maturation/harvest.

• optimal_min (optimum minimum temperature)
• optimal_max (optimum maximum temperature)
• base_temperature
• low_stress_threshold
• high_stress_threshold
• max_temperature
• frost_threshold
• sterility_risk_threshold (flowering only)

Parameter values are cited from reliable literature; unknown or unverified data are noted explicitly.

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1. Growth Stages and Temperature Parameters

Germination/Seedling Stage

• optimal_min: 15°C
• optimal_max: 25°C
• base_temperature: No clear literature value. Growth possible above 5°C; detailed value unverified [4].
• low_stress_threshold: Below 5°C growth slows; below 0°C injury risk increases [4][22]
• high_stress_threshold: Above 30°C poor germination; many sources warn of high-temperature germination inhibition [4][6]
• max_temperature: 30°C (germination becomes extremely poor above this) [4]
• frost_threshold: Tissue damage below -2.5°C; risk to seedlings at 0°C or below [22][23]
• sterility_risk_threshold: Not applicable

Key sources: [4][6][8][22][23]

Vegetative Growth (seedling to rosette and leaf expansion)

• optimal_min: 15°C
• optimal_max: 20°C
• base_temperature: No clear defined value. Estimated around 5°C (growth lower limit in many sources) [2][4]
• low_stress_threshold: Below 5°C growth largely stalls; injury risk near 0°C [2][6]
• high_stress_threshold: Above 25°C growth stops and quality declines; above 28°C damage is pronounced [2][11][14]
• max_temperature: 28°C
• frost_threshold: Growth possible near 0°C but significant damage below -2.5°C [23]
• sterility_risk_threshold: Not applicable

Key sources: [2][6][8][11][14][19][22][23]

Heading (head formation)

• optimal_min: 13°C
• optimal_max: 20°C
• base_temperature: Not stated
• low_stress_threshold: Below 5°C delayed or poor heading [6][8]
• high_stress_threshold: Above 25°C; heading impossible above 28°C [2][3][14]
• max_temperature: 28°C
• frost_threshold: Tissue damage below -2.5°C (head cracking, leaf injury); temporary tolerance near 0°C but not ideal for growth [23]
• sterility_risk_threshold: Not applicable

Key sources: [2][3][6][8][14][19][23]

Flowering (bolting, reproductive growth)

• optimal_min: Not clearly stated
• optimal_max: Not clearly stated
• base_temperature: Not stated
• low_stress_threshold: No clear numeric value. Below 13°C (especially 5–7°C sustained) promotes flower bud differentiation [6][7]
• high_stress_threshold: Above 28°C estimated sterility risk increase (from international literature) [24]
• max_temperature: Not stated
• frost_threshold: Not stated (estimated similar to other stages)
• sterility_risk_threshold: No clear value (for other Brassica crops, sterility increases above 28°C reported) [24]

Key sources: [6][7][24]

Maturation / Harvest

• optimal_min: 13°C
• optimal_max: 20°C
• base_temperature: Not stated
• low_stress_threshold: Below 5°C growth and quality risk [8][19]
• high_stress_threshold: Above 25°C head splitting; quality decline above 28°C [8][19]
• max_temperature: 28°C
• frost_threshold: Injury below -2.5°C. Post-harvest storage possible at 0°C and high humidity [8][23]
• sterility_risk_threshold: Not applicable

Key sources: [8][19][23]

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2. Growth Stage Parameter Comparison Table

Stage	optimal_min	optimal_max	base_temperature	low_stress_threshold	high_stress_threshold	max_temperature	frost_threshold	sterility_risk_threshold
Germination/seedling	15°C	25°C	>5°C*	<5°C	>30°C	30°C	-2.5°C	—
Vegetative growth	15°C	20°C	>5°C*	<5°C	>25°C (>28°C worse)	28°C	-2.5°C	—
Heading	13°C	20°C	—	<5°C	>25°C (>28°C impossible)	28°C	-2.5°C	—
Flowering	—	—	—	<13°C (differentiation at 5–7°C)	>28°C*	—	—	≈28°C sterility risk (reference)
Maturation/harvest	13°C	20°C	—	<5°C	>25°C (decline above 28°C)	28°C	-2.5°C	—

*Note: Few heirloom cultivars have precisely stated base_temperature; values are estimates.

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3. Individual Parameters and Scientific Background

• optimal_min/optimal_max: Common optimal ranges in Japanese extension, seed company, and municipal guidelines. As a leafy Brassica, cabbage grows well in cool climates [6][8][4].
• base_temperature: Most literature indirectly cites around 5°C as growth limit; not explicitly stated as GDD model base.
• low_stress_threshold/high_stress_threshold: Based on repeated domestic field trials and reports [4][6][7][14][19]. Summer planting and heat-period cultivation measures are common.
• max_temperature: Nearly universal in specialist literature as heading cessation and poor germination limit.
• frost_threshold: Low-temperature injury demonstrated below -2.5°C in seedlings and heading. Frost tolerance increases somewhat with cold acclimation but risk is generally near 0°C [22][23].
• sterility_risk_threshold (flowering): Cabbage is mainly grown for heads; flowering data is rare. As with Brassicas generally, sterility and pollination failure above 28°C are reported [24].

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4. Additional Scientific Notes

• For spring cabbage, sustained exposure near 5°C for about one month increases flower bud differentiation (early bolting) risk [6][7].
• Cold acclimation at seedling stage (5°C + 12-hour photoperiod) partly improves frost tolerance [22].
• Microplastic soil contamination may reduce cold tolerance; no clear threshold modification has been established [23].

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5. Unverified Data and Estimates

• Precise quantitative values for base_temperature and sterility_risk_threshold (flowering) are not stated in major Japanese or international literature and guidance. Estimation from GDD methods or growth cessation thresholds is possible but no official values were obtained; reference ranges are noted per stage.

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Conclusion

Temperature management at each cabbage growth stage is critical to avoid low- and high-temperature stress and achieve high-quality heading and harvest. Avoiding heat and cold at germination/seedling, ensuring cool conditions during heading, and temperature management through shipping strongly affect quality. Flowering temperature stress (sterility risk) rarely affects commercial head production but matters in breeding and seed production. More detailed research on base temperature and sterility risk thresholds is expected.

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Sources

[1] The Effect of High Temperatures on the Growth of Oriental Cabbages, ResearchGate: https://www.researchgate.net/publication/267342635_The_Effect_of_High_Temperatures_on_the_Growth_of_Oriental_Cabbages_Poster_Board_319
[2] At what temperature does cabbage need to be covered? Facebook: https://www.facebook.com/groups/1156935537680311/posts/8562616177112173/
[3] Efficient Cabbage Farming Techniques in Japan, Coconote: https://coconote.app/notes/fd39c186-2e79-4b22-94c6-c549472cffae
[4] Germination and seedling temperature guidelines for leafy Brassicas, Nagano Prefecture: https://www.pref.nagano.lg.jp/sakuchi/nosei-aec/joho/gijutsu/documents/hayousai-ondo.pdf
[6] Takii cabbage cultivation manual: https://www.takii.co.jp/tsk/manual/kyabetsu.html
[7] Spring cabbage and autumn-winter radish under climate change, Kanagawa Pref.: https://www.pref.kanagawa.jp/documents/27459/167-1.pdf
[8] Cabbage - BSI Bio: https://bsikagaku.jp/cultivation/cabbage.pdf
[11] How to Grow Cabbage, MSU Extension: https://www.canr.msu.edu/resources/how_to_grow_cabbage
[14] Cabbage & Chinese Cabbage, Clemson HGIC: https://hgic.clemson.edu/factsheet/cabbage-chinese-cabbage/
[15] How to Grow Cabbage in Your Garden, USU: https://extension.usu.edu/yardandgarden/research/cabbage-in-the-garden
[19] Relationship between Brassica growth and accumulated temperature and light, J-STAGE: https://www.jstage.jst.go.jp/article/naroj/2024/19/2024_1/_html/-char/ja
[22] Effects of Light during Low Temperature Treatment and Water Stress, JIRCAS: https://www.jircas.go.jp/en/publication/jarq/34/4/261
[23] Vulnerability of Brassica oleracea L. (cabbage) grown in..., ScienceDirect: https://www.sciencedirect.com/science/article/pii/S0098847225000279
[24] High‐temperature stress in crops: male sterility, yield loss and..., PMC: https://pmc.ncbi.nlm.nih.gov/articles/PMC10037161/