How can I deter snails when planting in chimney pots?

Question

I have previously only had a pot balanced in the top of a chimney pot and snails & slugs crawl up from the bottom inside. Now I want to plant a clematis more permanently to grow up the garage wall. Without cementing the chimney pot down, how can I fill it with growing medium but deter slugs and snails?

Thank you in anticipation

Answer 1

There are a few ways that you can go about this. Here is an article that will get you started:

https://www.gardeningknowhow.com/plant-problems/pests/insects/organic-snail-control.htm