I have experimented with media. They break down as the glucose is consumed. Agar is usually used in Tissue Culture. It is mostly the sugar galactose. [Lactose (milk sugar) is glucose+galactose]. The alternates are also principally formed from galactose. Agar is available at your local Chinese grocery. Gelatin would work for quick germinating seed, but does not hold up long term. In TC Agar is combined with sugar as a nutrient. The sugar is consumed and the gel remains firm.
Larry
Starting seeds in gelatin
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