Something to be aware of - there are 2 types of plantain: broad leaf & narrow leaf
I prefer the broad leaf for medicinal use, although I will use the narrow if nothing else is available. It's already coming up here, as are the wild violets
Have spent several hours gardening this week & am excitedly noticing all the wild plants popping up. Gotta start checking for fiddleheads!
You can absolutely use fresh plant material in soap, not an issue. In fact, I would recommend it. Blend it into some of your soap base oils, let it sit overnight to really get good & strong, use it the next day.
Likewise in tinctures - fresh plant material - providing this is not medicinal mushrooms we are speaking of such as turkey tail, various other medicinal polypores. No I'm not a mycologist, but I harvest medicinal mushrooms a lot, and tincture / decoct them. I air dry them, then use them or store them for later use.
You absolutely can use raw plant material in oil infusions as well, if you're adding those oils to soap right away - eg. within 24-36 hours. If infusing for later use, such as in salves, lip balms etc, dry plant material is best. That being said, there are exceptions, such as St John's Wort, which is best infused immediately after picking, always fresh. It will turn your oil blood red if left long enough - my favourite is St John's Wort in castor oil, which is absolutely STUNNING. It's amazing to see the tiny yellow flowers turn the oil such an intense shade of red. Have not yet tried it in soap, but it is very healing in salves I make.
If infusing fresh plants into oils. It's important to use something to keep all the plant material under the oil, such as a fermentation weight or a suitably sized, clean stone. I do the same when infusing my honey with dandelions, gum weed, yarrow & more. With alcohol, it's not as big of a deal.
I will be trying yarrow in soap this year that is based on so-called 'weeds' as the essential oil is blue & I am wondering what color the strongly infused oil & plant material will turn me soap - the leaves, the roots & the flowers.
Nettles give a beautiful green color! Have already been out picking them a few weeks ago. Time for another round of spring picking!