Am I propagating an actual Mint plant or is it a Pennyroyal plant?
it's from a grocery store.

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close-up and size of a leaf one vine
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  • Pennyroyal is a type of mint. Commented Jan 28, 2021 at 3:44
  • 1
    @andrewbuilder I know, but Pennyroyals have a reputation of being toxic. thus not recommended for cooking. I'm asking for that.
    – moh91
    Commented Jan 28, 2021 at 5:02

1 Answer 1


The mints are somewhat variable, and the many species and hybrids tend to cross a lot, but pennyroyal has a couple of characteristics that might be helpful: the leaf is generally small, much smaller than the leaf in your last image, and the flowers tend to be widely spread out along the stem. Based on the leaf size alone it is likely not pennyroyal, and you would need to grow it on in regular soil to allow it to flower to check the inflorescence.

We consume mint in such tiny amounts that the downsides are few; we could also say that apples and potatoes are toxic from a certain point of view - who wants to eat a bucketful of apple seed strychnine or potato skin solanine? Many gardeners would just have a little nibble to see if it had any nastiness.

This is the wrong forum for advice on toxicity; gardeners as such are not qualified to comment on that, talk to your doctor or nutritionist. All mints have a reputation as possibly harmful either to humans or animals since it is relatively easy to get concentrated oils from the whole mint family.

  • OK thx, anything about their smell? can one say which one has a sharper smell (vs softer smell)? or is it depends on the variety and can be misleading?
    – moh91
    Commented Jan 29, 2021 at 1:44

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