If the Hall's honeysuckle is in partial to full shade, move it into the sun, or take vine cuttings and plant them in a full-sun location. Although the plant tolerates shady locations, it blooms better when grown in full sun with somewhat dry soil. Water it only when the soil is almost completely dry. Drought stress sometimes shocks honeysuckle into blooming.
Fertilizing Hall's honeysuckle at the right time with the right formula may promote its blooms. Hall's honeysuckle requires one application of 10-10-10 fertilizer a year in the spring. A high-nitrogen fertilizer encourages the plant's foliage production the expense of flowers. The first number in the fertilizer formula represents nitrogen.
Since Hall's honeysuckle blooms on the previous season's growth, prune it right after it finishes blooming. If your honeysuckle was pruned in the winter or spring, you may have cut off this season's buds. Pruning 1/2 inch of the tips of new growth also promotes blooming. This causes new branches and the possibility of more buds. Tip prune the Hall's honeysuckle throughout the growing season.
If nothing works, consider rejuvenating the Hall's honeysuckle by cutting it to the ground. Wait until autumn and cut the entire vine to the soil with pruning shears. Fertilize it in the spring with a 10-10-10 fertilizer at the rate listed on the package at the first sign of new growth. It should bloom by June.