Remove the old leaves and flower buds. Remove any cane sections that are damaged including areas of black bark and shrivelling. Now that your plant is established, you probably should remove any twiggy growth, less than 3/16. Make pruning cuts just above a bud eye (located at every former leaf juncture-- a bump with a smiley mouth under it). If parts of the plant don't support strong growth in late May, the canes have invisible freeze damage and should be cut back. You might prune around 2 weeks before the average date of last frost. Ask experienced local gardeners. Remove the old leaves now because they may carry fungus disease. Sounds like it is doing fine without winter care. Don't prune in fall. Whether or not to add a 12" mulch or pile of soil is a judgement call depending on whether this variety is in danger of freezing out in your climate. At least wait until temperatures approach zero. If there is deep snow cover, that gives substantial protection.

A bit small for ID, can we get a closeup?

Can you tell us where this plant is growing? Is it in your zone or did you see it somewhere else? Also are those yellowish blobs fruit or flowers? And if they are flowers are they a pompom sort of affair? Does it have thorns?

imagardener2 and juneroses Thanks for the fast response. I have wondered what this bush was for several years. Now that it has started blooming it is really an attention getter. Mine is more like a bush with multiple branches but is now probably 12 foot tall and covered with blooms. I don't see that many sulfer butterflys on it but there is an Iguana living in mine. Go figure. Only in South Florida.