We have a old climbing rose near the corner of the house. It had been planted at the base of an old dogwood, and was overgrown by ivy and other vines. Nevertheless, it flowers almost all summer, without any supplemental water, no signs of any leaf diseases, and best of all has a lovely rose fragrance.
My gardening companion throughly cleared out the overgrowth there last summer and opened up the space around the rose.
It's repaid those efforts this spring by bursting into full flower in huge large clusters, looking quite the specimen compared to its 'poor' days.