There's a way - since you have plenty of other Color you can go and start hunting the predators, that give a reward. Big shatun's (black potato monsters) have Silver in them, while the Scorpio's offsprings - nutlike creatures - have random Color. Since they're infinite, you can hunt them until you have enough to build your last garden, for example. Also, you really need only 97% of total Color to reach Turgor, so there's a small margin you can not worry about.
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How happy is the blameless vestal's lot! The world forgetting, by the world forgot.
Eternal sunshine of the spotless mind! Each pray'r accepted, and each wish resign'd;
---- Alexander Pope