seeds growing years later

A few years ago I planted about 5 different thistles with variable results, mostly disappointing but 1 enormous cotton thistle (in the front garden) which was great. Since then I haven't seen any of the thistles until this suddenly appeared in the back garden. 

It's not nearly as tall as the first cotton thistle I grew.

This vipers bugloss appeared in the front garden a few years after planting them in the back garden.

Pussycat likes to go next door and spend time with my neighbour.

Unlike the previous flowers, these neon violet pansies I actually planted this year in March.

The front garden has grown quite lush after all this rain.