We moved into a rented townhouse 6 months ago which has a front "patio" which keeps us about 8 feet back from the street, with steps going up to the front door. This ws nicely kept with a mixture of things planted around the edge of the patio and things in giant tubs going along the side of the steps and up when we moved in.
Everything in the patio is brown and straggly and there are green things poking through the gaps in the patio. I have never gardened before and haven't a clue what to do with it to make it nicer. Every house plant I've ever had has withered and died at my very touch 
Questions:
- should I pull out(?) the green stuff coming up in the cracks (are these weeds?)
- What should I get to go in the tubs? It needs to be something hardy (so I don't kill it) and the patio is very very sunny (for Northern UK) but not at all sheltered from wind.
- do I need to do anything with the bushes etc that are planted in the ground? There are a few different types and they are varying colours of green. And quite bushy.
- where do I buy such things? Homebase or somewhere?
- is March the right time to be doing this?
Thank you for any help you can give! I'll make you all a nice cuppa, and I promise to post pictures once finished if that entices you 