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The idea here needs to be the chemical itself, which you haven't specified. Thankfully I'm here to help. |
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Just as spring is coming in, fill a watering can with water and add a glass of gin - the grass comes up half-cut. |
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You need a kind of chemical escapement; the first reaction requires light, the second requires absence of light and the completion of the first reaction, the third requires light and the completion of the second reaction, and so on. Otherwise the rate would depend on total light exposure rather than on the number of days passing. This would actually work for grass, since the meristems are basal. (+) |
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