'Roof Gardening'............???

I couldn't believe this when I first noticed it.....!!
Isn't Nature a wonderful thing......just how did this grow in our downpipe??
I'm in our front driveway every day....but only 'noticed' this a few days ago...
Now I know things you're familiar with means you don't spot change but I really think this sprouted very quickly....
I think it's a sheaf of wheat.......does anyone agree??
As to how it got there....I have no idea.....I certainly didn't sow it.....!
Maybe I'll start a roof garden!!!!!!

We had a beautiful day today......sun all day...!!!!