We can get wind gusts over 60 mph. It's not immediately next to anything to secure it very well, but I put a chain from the very top of the obelisk and attached it to the corner of the garage, maybe 18" long. That keeps it from falling completely over, so it doesn't smash its vines or flowers in planters near it, it just stays pretty much upright but on an angle.
But then I had the brilliant idea to secure it better by having it attached to the other similar sized planters around it, it should have kept it from tipping over. And it did in a way... the planter itself didn't budge, but the vines and the dirt were going to bend in that wind, and it just literally ripped the plastic planter apart. It really was kind of funny to see! But I couldn't find a big enough planter to get it back into, so it hung slanted with the dirt ball around it and the drip system still giving it water daily for almost 2 weeks. And surprisingly, it lived!
Next summer I'm going to stick 2 tall iron rods or the metal fencing posts you see for wire into the grass that's just a few inches behind the planter, and secure the trellises to those rods higher up. I have hopes that will work, but I actually wouldn't be too surprised to see those pulled out in a good wind storm though!
