A small colony of intergalactic mushrooms have invaded our nice, quietly blossoming floral planters. I don't think that they're safe or edible either but I'm sure they want us to believe that they have come here "in peace". Yeah, every invader starts off with that line as they plan their next move of mass exploitation and colonial conquest. Meanwhile they're crowding out our summer plantings and sending their spores and probes deep into our hallowed compost in order to connect with the mother-ship or whatever underground HQ they might have.
Communications will be established and ... I forget how it all works for fungaea with their tendrils, networks, electrical impulses, delicious flavours and mind warping chemical properties. However their texture can sometimes be a little unpleasant if they're not properly prepared i.e. cooked. (Never let them hear you say that). They must not be underestimated, they are the masters of the silent reprisal and time is on their side.