It's a difficult one but looking at my salvias I was thinking which is my favourite right now. Some are past their best so it's judgement time.......I have Amistad with long bright purple flowers on black centres still lookingfantastic. Leucanthemum has lilac and white flowers on shrubs some 5' high amd this is a contender. Then uliginosa ..sky blue spikes with white tips which will continue to flower for many weeks yet. Then patens with pale blue or dark blue flowers. I think Amistad takes the honours.
So, what is your favourite variety, right now, of your chosen group of plants, be it roses, dahlias, shrubs, heleniums, etc.?