This is Carnoustie’s community garden.
You are looking for a hand sized cache containing a PET tube.
As listed on the Food is Free Carnoustie website, http://foodisfreecarnoustie.weebly.com/
Food Is Free Carnoustie hopes to bring people together with the purpose of taking neglected spaces and gardens and turning them into community spaces which then provide free harvests to anyone. Once the fruit and veg is ready, it will be harvested and displayed in various public places around the town and offered free to anyone who wants it.
Please note that younger/shorter cache hunters might need a helping hand with this one