Types
Common Jasmine
Common jasmine or poet’s jasmine (Jasminum officinale), also called true jasmine, is a deciduous vine with clusters of starry, pure-white flowers that bloom all summer. It’s a twining climber with deep-green leaves that have five to nine leaflets, each up to 2-1/2 inches long. The very fragrant flowers are up to 1 inch in diameter.
Hardy to Zone 7, the vine grows vigorously (1 to 2 feet per year, up to 20 feet) and looks stunning climbing a large pergola, fence, or very large trellis. In the landscape, jasmine can also be pruned as a shrub near the house or near a walk so its intense fragrance can be enjoyed and so you can watch hummingbirds and butterflies come to the flowers. Common jasmine is native to Asia.

Winter Jasmine
Winter jasmine (Jasminum nudiflorum) is an “old-timey” shrub often found around Victorian homes. The beautiful yellow flowers are unscented, 1 inch wide, and they appear in winter or early spring before the leaves unfold. Winter jasmine is a good bank cover that will spread by rooting where the stems touch the soil. It is also very attractive when planted above retaining walls, with the branches cascading over the side. Hummingbirds love this vigorous vine!
Most other Jasminum species are semitropical vines, which are best planted in the spring after the danger of frost has passed.
Not a True Jasmine
Star jasmine, aka Confederate jasmine (Trachelospermum jasminoides), looks similar but is not a true jasmine. Hardy in USDA Zones 7B through 10, this native to China has phlox-like flowers that bloom on twining stems in spring and summer and are highly scented.
Your plant is most likely not getting enough light. If you can move it to a room with a southern window, the increase in light might encourage it to put on some new growth. Additionally, try adding some balanced fertilizer the next time you water the plant. Speaking of which, watering three times a week might be too much, especially in winter, when most plants slow down growth and don't need as much water. Make sure that at least the top 1/2 inch of soil is drying out between waterings.
Common jasmine requires high humidity as well as sunlight to flower, plus adequate moisture and good drainage. Perhaps lack of humidity was the problem? It requires only moderate soil fertility, so nothing too special, so the potassium may have been unnecessary and ineffective. The plant is hardy in zones 7 to 10, so it should be fine outdoors. As for cutting back, spring is the best time—after bloom, which you said did not happen, of course—and heavy, even "drastic," pruning is recommended to contain its size. You could probably cut it back some now. This might inspire more base growth instead of limbs in the spring.
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