Knox Gelatin

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While cleaning out my kitchen cupboards I came across a package of Knox Gelatin . Not sure how long it had been there . I was looking for the expiry date on it , and as I continued I started reading . It says that you can feed your plants a mixture of Knox Gelatin to perk them up to look healthier .

I don't know if this applies to all houseplants including orchids or just the leafy plants . It has a high nitrogen content , orchids need a high nitrogen fertilizer during the active growth season .

Has anyone ever tried this on any of their plants or is there any truth to it at all . Any info would be great reading . Thanks.