lellis2k wrote:

hi guys!

I know nothing about gardening and my back garden is just concrete

In the middle though is a hole where a rotary clothesline was.

It's full of mud and so a small weed has grown in it, lovely!

What can I plant in its place, I want the biggest/tallest thing
possible.

It's for a bit of a laugh and not expecting much but anything better
than a weed would be good

1" wide, 4" deep. Suggestions?

Fill with K-Y and have at it... wait and see what sprouts.