Rosemary - Rosmarinus - has three basic habits of growth - Upright; Bushy; Prostrate/spreading. All are suitable for most places in the garden, and particularly suited for growing in containers.
Rosemary prostratus will flower in most months of the year! Especially if grown in dry conditions. Sometimes known as Rosmarinus repens, or Rosmarinus lavendulaceus. It is not as hardy as the Rosmarinus officinalis group, and seems to do better in really dry places. I once grew one atop a stone wall and it lasted through many winters in Kent. The secret being that it was well drained in all weather. It rarely stopped flowering!
Rosmarinus officinalis types seem to be the hardiest. Outstanding amongst them being Rosmarinus officinalis Miss Jessopp's Upright - sometimes sold as Rosmarinus fastigiata. Certainly the growth is the most fastigiate of all the Rosemary shrubs, but this does not mean it is the best for a hedge - unless you are prepared for an informal hedge with the attractive upright growing spikes of flower. This makes for an interesting wavy effect!
Rosmarinus officinalis Aureus or Rosmarinus officinalis Aureovariegatus is considered attractive by some - especially writers who do not know it. It is only the fact that it has unique variegated leaves than makes it 'wanted'. The leaves are so thin for the variegation not to be noticed - thereby making it look a bit sick for my liking.
Dark Blue The three mentioned above are various shades of blue, but the deepest blue is for me has always been Rosmarinus Tuscan Blue - it also has dark green foliage..
Pink Flowered The best of the pinks - that also looks attractive - is Rosmarinus Miss Jessopp's Upright 'Roseus'. It has the added attraction of being quite upright in growth - as has its parent.
White Flowered Rosemary is best represented by Rosmarinus officinalis Alba - but who wants a white rosemary!
Arching Growth. A stunning Rosemary for banks and large containers is Rosmarinus Severn Sea(s). Its branches arch over well, but it is not a ground hugger like R. prostratus. Stunning in a large container with its brightest of blue flowers.