There are numerous manufacturers producing anthocyanin-based foliar fertilizers. Below are some prominent ones:

1. Agrosist Corporation, USA: A high-tech enterprise specializing in the research, development, production, and sales of plant nutrients and pesticides. Their products include various types of foliar fertilizers, among which are formulations containing anthocyanins.

2. Merck KGaA, Germany: As a global leader in pharmaceuticals and life sciences, Merck also boasts extensive experience and technological expertise in plant nutrition. Their product lineup includes diverse foliar fertilizers, including anthocyanin-based options.

3. Institute of Plant Nutrition and Nutrition, Chinese Academy of Agricultural Sciences, China: A research institution under the Chinese Academy of Agricultural Sciences, focused on plant nutrition research and practical applications. Their products feature multiple foliar fertilizers, including those with anthocyanin components.

4. DSM, Netherlands: A multinational chemicals leader with a broad portfolio in agriculture, industry, and energy. DSM offers various foliar fertilizers, including anthocyanin-containing formulations.

5. Ebara Chemical Co., Ltd., Japan: A Japanese chemical company specializing in industrial and agricultural chemicals. Their product range includes diverse foliar fertilizers, such as anthocyanin-based solutions.

6. Rhodia (now Solvay), France: A global biotechnology pioneer with a strong presence in agriculture, pharmaceuticals, and bioengineering. Their offerings encompass multiple foliar fertilizers, including anthocyanin-rich products.

7. ICI plc, UK: A leading global chemicals company with a wide array of agricultural, industrial, and energy products. ICI’s foliar fertilizers include formulations containing anthocyanins.

8. Agricultural Research Institute Ltd., Australia: An Australian agricultural research organization dedicated to scientific innovation and outreach. Their products feature various foliar fertilizers, including anthocyanin-based variants.

These manufacturers and institutions are renowned for their expertise and technological advancements in plant nutrition and agrochemicals. Their anthocyanin-based foliar fertilizers are recognized for reliability and effectiveness. When selecting a supplier, consider regional availability and specific needs to choose the most suitable option.