If it’s big enough to see, it’s likely actual spider and not spidermite. If under the pot then probably a ground living spider — some Like to use the drain hole. If it’s warm where you are the tiny ones could be hatchlings.
Personally I leave spiders alone unless I know for sure that it is a venomous type — not many of those in my area — or they are in nuisance spot that could scare one of my DD’s who is very afraid of spiders. I love it when they make a nest/home in out of the way spot on or near my plants because they will catch and eat the pests that will attack my plants.
Every spring in my garden, there is a hatching event of garden spiders — just like in Charlotte Web, the tiny babies spin a sail-silk and fly away. They are ravenous and will eat each other if they don’t scatter quickly, and any tiny bugs — like aphids and fleabeetles, and pest bug larvae are swept up by them as well. It’s only when they are that tiny that they will also eat teeny pests like spider mites. I love seeing those new members of my Garden Patrol.
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