Horticulture and Botanical Classification of Vegetable crops and Horticultural crops

 

Horticulture and Botanical Classification of Horticultural crops

Horticulture is an important branch of agriculture concerned with the cultivation and management of fruits, vegetables, flowers, plantation crops, spices and other horticultural crops. Horticultural crops differ in their botanical characteristics, climatic requirements and environmental adaptations. Therefore, they are classified on different bases for systematic study and better understanding.

For a detailed understanding of horticulture, its definition, branches and importance, read our previous post here.

Classification of Vegetable Crops

Classification is the systematic method of grouping different plant species for identifying and cataloguing information about cultivated plants and crops. Vegetable crops are diverse in their edible parts, including leaves, young shoots, fruits, roots, tubers, rhizomes, corms and stolons. Many vegetable crops also have more than one edible part. The importance of individual vegetable crops varies among countries according to their dietary patterns and food habits.

For a detailed classification of vegetable crops, read our previous post here.

A. Botanical, Climatic and Environmental Classification

Fig.: Botanical, Climatic and Environmental Classification

  1. Based on Botanical Relationship

  2. Based on Climatic Zones

Tropical Vegetables (18-38◦ C)	Subtropical Vegetables (15-32◦C) (Short day, short winter with high temperature)	Temperate Vegetables (0-15◦C)
Amaranthus Cassava Cluster bean Coriander Cow pea Drum stick (moringa) French bean Most cucurbits (Bitter Gourd, Cucumber, Ridge Gourd, Sponge Gourd, Muskmelon, Water melon) Multiplier Onion (Aggregatum onion) Okra Solanaceae (Brinjal, Chilli, Tomato) Sweet Potato	Brinjal Cabbage Capsicum Cauliflower Cucurbitaceae (Bitter gourd, Bottle gourd, Buffalo gourd, Chow-chow, Cooking melon, Cucumber, Gherkin, Ivy gourd, Kakrol, Long melon, Muskmelon, Pointed gourd, Pumpkin, Ridge gourd, Round melon, Snake gourd, Snap melon, Spine gourd, Sponge gourd, Summer squash, Teasel gourd, Tinda, Watermelon, Wax gourd, Winter squash) Cowpea Ginger Okra Onion Potato Root crops (Beetroot, Carrot, Radish, Turnip) Tomato Turmeric	Asparagus Beetroot Cole crops (Cabbage, Cauliflower, Chinese cabbage, Kale, Knol-khol, Sprouting broccoli, Brussels sprout) Root crops (Carrot, Radish, Turnip, Rutabaga) Potato Spinach Onion Garlic Pea Fenugreek

2  

      3. Based on Temperature Requirement (Thermoclassification)

Season	Warm season vegetables	Cools season vegetables
Optimum temperature ranges(C◦)	21-30	16-22
Vegetable crops	Solanaceous vegetables (Brinjal, Chilli, Capsicum, Tomato) Okra Cucurbitaceous vegetables Legume vegetables (Cluster bean, Cowpea, French bean, Hyacinth bean, Lima bean, Winged bean) Sweet potato Amaranthus New Zealand Spinach Drumstick	Broad bean Bulb crops (Garlic, Onion, Leek, Chive, Welsh onion, Shallot, Multiplier onion) Cole crops (Broccoli, Brussels sprout, Cabbage, Chinese cabbage, Cauliflower, Kale, Knol-khol, Sprouting broccoli) Leafy vegetables (Celery, Coriander, Fenugreek, Kale, Lettuce, Mustard greens, Parsley, Spinach, Swiss chard) Pea Root crops (Beetroot, Carrot, Parsnip, Radish, Rutabaga, Turnip) Tuber crops (Potato, Cassava, Elephant foot yam, Greater yam, Lesser yam, Colocasia)

 4. Based on Growing Season

Season	Month	Vegetable crops
Kharif	June to September	Tomato, Brinjal, Chilli, Okra, Cowpea, Indian bean, Cluster bean, Cucurbits (Cucumber, Bottle gourd, Bitter gourd, Ash gourd, Ridge gourd, Sponge gourd, Snake gourd, Pointed gourd, Ivy gourd), Sweet potato etc.
Rabi	October to January	Cole crops, Root crops (Radish, Carrot, Turnip, Beetroot), Bulb crops (Onion, Garlic), Leafy vegetables (Palak, Beet greens), Pea, Potato etc.
Summer (Zaid)	February to May	Brinjal, Tomato, Chilli, Okra, Cowpea, French bean, Cluster bean, Cucurbits etc.

 

          5. Based on Hardiness

Category	Frost tolerance/characteristic	Examples
Hardy vegetables	Withstand frost without any injury	Broccoli, Cabbage, Pea, Brussels sprout, Garlic, Onion, Leek, Radish, Spinach, Turnip, Parsley etc.
Semi-hardy vegetables	Generally, they are not injured by light frost	Carrot, Cauliflower, Potato, Celery, Lettuce, Beet, Spinach etc.
Tender vegetables	Cannot withstand frost and may be killed even by light frost	Tomato, Chilli, Brinjal, Okra, All Cucurbits, French bean, Sweet potato, Cassava, Yam, Drumstick, Elephant foot yam etc.

 

4     6. Based on Tolerance to Soil Acidity

Tolerance to soil acidity	Soil pH	Examples
Slightly tolerant (Less tolerant)	6.8-6.0	Okra, Cabbage, Cauliflower, Muskmelon, Onion, Spinach, Garlic, Lettuce, Leek, Asparagus, Broccoli, Beetroot, Chinese cabbage
Moderately tolerant	6.8-5.5	Brinjal, Pea, Pumpkin, Radish, Tomato, Cucumber, Kohlrabi, Summer squash, Winter squash, Turnip, French bean, Chilli, Carrot
Very tolerant (Highly tolerant)	6.8-5.0	Potato, Sweet potato, Watermelon, Rhubarb, Yam, Endive

 

5  7. Based on Tolerance to Soil Salinity/Soil Salt Content

Tolerance level	Soil EC (dS m⁻¹) *	Vegetable crops
Sensitive (Less tolerant)	0-2	Onion, Carrot, Garden pea, Radish, Bean, Potato, Sweet potato, Brinjal, Artichoke, Celery, Sweet pepper, Snake gourd
Slightly tolerant	2-4	Cucumber, Chilli, Lettuce, Sweet corn, Tomato, Broccoli, Cauliflower, Watermelon, Pumpkin, Muskmelon, Bottle gourd
Moderately tolerant	4-8	Beetroot, Tomato, Spinach, Sprouting broccoli, Summer squash, Winter squash, Asparagus, Kale, Turnip, French bean, Amaranth, Corn, Cabbage, Onion, Palak
Highly tolerant	8-16	Asparagus, Swiss chard, Beetroot, Moringa, Bitter gourd, Ash gourd

^*Soil Electrical Conductivity in deciSiemens per metre, (dS m⁻¹ = deciSiemens per metre), (1 dS m⁻¹ = 1 mS cm⁻¹ = 1 mmho cm⁻¹)

 

6  8. Based on Tolerance to Salt (NaCl Concentration)

Tolerance level	NaCl concentration (M)	Examples
Sensitive	0.25	Tomato, Snake gourd
Medium tolerant	0.50	Chilli, Okra, Cabbage, Sweet potato
Tolerant	0.75	Amaranth, Cauliflower, Onion, Radish, Bottle gourd
Highly tolerant	1.00	French bean, Ash gourd
Very highly tolerant	1.25	Bitter gourd

 

2    9.  Based on Soil Factor

Class	Habitat	Vegetable crops
Basophiles	Vegetables which grow well in alkali soils.	Asparagus, Beetroot, Spinach, Garlic, Cabbage, Kale
Acidophiles	Vegetables which grow well in acidic soils.	Potato, Sweet potato
Neutrophiles	Vegetables which grow well in neutral soils.	Carrot, Radish, Pea, Onion, Cauliflower, Broccoli, Tomato
Psammophytes	Vegetables which grow well in soil having sand and gravel.	Carrot, Radish, Potato
Petrophytes	Vegetables which grow well on rocks.	No standard vegetable example verified

3      10. Based on Water Relationship

Plant habits	Ecology definition	Vegetable crops
Water loving plants	Hydrophytes	Taro, Swamp taro
Terrestrial plants	Mesophytes	Tomato, Brinjal, Chilli
Drier habits plants	Xerophytes	Moringa, Wild species vegetables

 

4   11. Based on Water Requirement

Tolerance level	Vegetable crops
High	Capsicum, Cabbage, Cauliflower, Knol-Khol, Radish, Ridge Gourd, Turnip, Beetroot, Leafy vegetables
Moderate	Tomato, Brinjal, Chilli, Cucumber, Onion, Carrot, Potato
Low	Garden pea, Dolichos bean
Very low	Moringa, Watermelon, Muskmelon, Pumpkin, Ash gourd, Elephant foot yam

 

5  12. Based on Rainfall and Irrigation Requirement

Rainfall	Vegetable crops
Rainy (Rainfed cultivation)	Pumpkin, Chilli, Brinjal, Dolichos bean, French bean, Radish, Ridge gourd, Turnip, Beetroot, Coriander, Watermelon, Muskmelon, Okra, Cooking melon
Summer (Irrigation)	Tomato, Brinjal, Chilli, Cucumber, Onion, Carrot, Watermelon, Coriander, Okra
Winter (Rainfed and Irrigation)	Potato, Capsicum, Cabbage, Garden pea, Cauliflower, Knol-Khol, Beetroot, French bean

 

6     13. Based on Root Depth in Soil

Name of Classification	Root depth (cm)	Vegetable crops
Very shallow rooted	15-30	Onion, Lettuce, Radish
Shallow rooted	30-60	Cole crops, Potato, Radish, Garlic, Cowpea
Moderately rooted	60-90	Cucumber, Muskmelon, Brinjal, French bean, Carrot, Beetroot
Deep rooted	90-120	Summer squash, Chilli, Garden pea, Turnip
Very deep rooted	120-180	Winter squash, Pumpkin, Sweet potato, Tomato, Moringa, Water melon, Asparagus, Cluster bean

 

7       14. Based on Lime Requirement

No requirement	Moderate	High	Very high
Potato, Watermelon, Tomato	Carrot, Pea, Cucumber	Brinjal, Cabbage, Cauliflower	Chilli, Onion, Spinach, Lettuce

 

  B. Edible, Chemical and Nutritional Classification

15. Based on Edible Parts Used as Vegetable

15. Based on Predominant Organic Acid Present

16. Based on Vitamins and Nutritional Value

17. Based on Plant Pigments

18. Based on Toxic Substances Present in Vegetable Crops

19. Based on Chemical Compounds Present in Vegetable Crops (Aroma, Pungency, Flavor and Phytochemicals)

Note: The above classifications cover the botanical, climatic and environmental aspects of vegetable crops. Further classifications based on their edible, chemical and nutritional characteristics will be discussed in our next post.

References.

1. Food and Agriculture Organization of the United Nations (FAO). (2012). Good Agricultural Practices for Greenhouse Vegetable Crops: Principles for Mediterranean Climate Areas. - irrigation-water salinity and vegetable crop responses to salinity.
2. Ganeshamurthy, A. N., Kalaivanan, D., & Sathisha, G. C. (2016). Management of Vegetable Crops in Acid Soils of India. In K. V. Peter (Ed.), Innovations in Horticultural Sciences. New India Publishing Agency. - vegetable crop pH ranges and tolerance to soil acidity.
3. Gupta, S. N. Instant Horticulture. Jain Brothers, New Delhi.
4. Indian Council of Agricultural Research / National Science Digital Library. Tropical and Subtropical Vegetable Crops. - climate and soil requirements, temperature, soil acidity, salinity and related vegetable classifications.
5. Kumar, A. (2021). Climatic Requirements of Horticultural Crops. Indira Gandhi National Open University (IGNOU). - climatic zones, temperature and environmental requirements.
6. Madhusudan Reddy, K., & Randheer Kumar. (2023). Compiled Vegetable Science (3rd ed.). Jain Brothers, New Delhi.
7. Muthukumar, P., & Selvakumar, R. Glaustas Horticulture.
8. Principles of Horticulture. - climatic-zone classification and advantages of classification in horticultural crop production.
9. Sahoo, D., & Naik, B. (2020). Tropical and Subtropical Vegetable Crops. - soil acidity tolerance and root-depth classification of vegetables.
10. Singh, Jitendra. (2025). Basic Horticulture (6th ed.). Kalyani Publishers. 

Conclusion.

The classification of vegetable crops provides a systematic understanding of their botanical relationships, climatic requirements, temperature preferences, growing seasons and environmental adaptations. It helps in the identification, comparison, grouping and scientific study of different vegetable crops and makes their diverse characteristics easier to understand. Knowledge of these classifications is useful for understanding the suitability of different vegetables under specific climatic, soil and growing conditions. It also provides a strong conceptual foundation for the study of vegetable science, crop production, crop improvement and management practices. The classifications presented in this post are particularly useful for B.Sc. Agriculture, B.Sc. Horticulture, M.Sc. Horticulture and General Agriculture students, as well as for beginners and students revising their basic concepts. This classification framework will also help readers understand the edible, chemical and nutritional classifications that will be discussed in the upcoming posts of this series.