What Would Their Answer Be?

In south Texas cactus grows abundantly seemingly without nutrients. Leave a piece of machinery sit for a year without use and when you come back there will be cactus growing in it, around it, or under it. Maybe you can see the two leaves growing out of the fork of an old mesquite tree. It is out behind the cattle pens. I've seen it grow all kinds of places. I've been keeping an eye on a cactus plant on the main street leading into our neighborhood. I really want to take a picture of it but it is on private property. The cactus is growing on the roof of a house. The house has a flat roof and is rather unkempt. I'm not judging here as it could be an elderly person or people who can not afford maintaince or not able to do labor. Anyway I pass this house most everyday and I've had my eye on this cactus plant. I guess because of the rain we had it has grown some and it looks as if it is trying to bloom. Probably has a thin layer of dirt on the flat roof and a bird planted it. I would not take a picture on private property without asking permission sooo would they tell me to to get off their property or would they invite me in for a cup of coffee? Humm, of course I would offer to take a picture for them too.