Do you have any problems with birds or other animals eating the plants?
Just make sure there are no places for squirrels to nest around or on the deck.
There is a tree next to my deck.You can't have more squirrels than us. On the deck they're only a problem if there's adjacent nesting sites.
Should be good then!Squirrels prefer a protected, hidden area such as a hole in a tree or a space under the deck. If there are no holes or hidden places within 3 meters, the plants should be ok.