There's a grotty set of flower beds which are completely unloved at the local outdoor swimming pool. I'd like to do something to make them look prettier. I'm very new to gardening so I don't know much 
The soil is completely neglected so I've already spread some fertilizer on it, kind of granular stuff.
We're in the Netherlands so the climate is like the UK but a bit more extreme, in high summer you can get 2 weeks without rain and temperatures of 28 - 33 each day. Most of the beds are in full sunlight, one is shaded by a lovely old tree.
I don't know what the current scrubby bushes are except that they have lots of thorns.
i've planted a bit of lavender and three lonely Chinese pennisetum and scattered some mixed annual seeds in the hope that it's not too late for them to grow.
Watering will be difficult, they don't have a tap with a screw attachment for a hose so all I can do is lug a few buckets of water and they are quite big beds
Love to hear any ideas of what would look pretty, be low maintenance and not need much water? :)