jmoore

That technique won't work for making a silver solution which is effectively what you need to make. Distilled water doesn't conduct electricity. For silver ions to exist, which is effectively what you are trying to make they need a partner ion eg silver and nitrate or chloride that kind of thing. Distilled water has nothing dissolved in it at all and so doesn't conduct.

I'm also confused about a 'colloidal silver'. A colloid is a solid suspended in a liquid, suggesting that you have solid silver suspended in some kind of carrier. Again your electrolysis technique wont work for this purpose.

Unfortuately silver metal only really dissolves in either an acid such as nitric or hydrochloric or cyanide all of which will be deterimental to your plants.

It woud be easier to start with ready prepared silver nitrate (expensive)

Don't believe all you see on youtube.

Sorry to pee on your parade, but there are some fundemental errors in chemistry that needed to be addressed.