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Vegetable Statistics - US Department of Agriculture
Information on this crop which can be used with the spines removed as a green vegetable, the necessary environment, management, harvesting and processing.
Information on the wide array of fertilizing materials, formulations and methods that are available, and the timing of applications, which will vary depending on the crop and soil.
Comprehensive information on cultural practices, economics, irrigation, nutrition and fertilizers, pest management, post-harvest procedures and marketing.
The answers to all your biology questions. The site offers free resource for biology-related information in forms of tutorials, dictionary, articles and forums.
Information from the New Zealand Institute for Crop and Food Research on cultivating this traditional Japanese vegetable, its environmental requirements, possible yield and markets.