a smell coming from the containers
I just planted some ornamental grasses (purchased from a garden centre) in 5 gallon containers on Saturday. The roots looked healthy and bright, and not rootbound at all. I was impressed that such big grasses had such few roots. The soil I got in bags from a big box garden centre. The containers were previously used for carrying gravel. When I planted I did not notice any smell at all. I gave them a thorough water and haven't needed to water them since. I drilled big holes into the bottom of the containers, and layered in gravel too, so the drainage is good. But after about 2 days of rain, and high humidity, there is a smell coming from them - I think!
I live in a condo and the plants are on a balcony. It should be noted that after a year with 4 sinus infections, my sense of smell is reduced. So if I'm smelling something, there must be a smell. I don;t want to affect my neighbours.
Please help ...
What is causing the smell?
How can I get rid of the smell?