In zone 7 and colder, try growing rosemary in a container you can bring inside in cold weather. If your soil contains clay and tends to drain slowly, amend the soil by adding some coarse sand at planting to improve its drainage, or plant rosemary in a raised bed. You can harvest your rosemary after new growth is generated, or about 6 weeks after planting. New growth on your plants is a promise of blooms, big beautiful leaves, or, at the very least, an extended lifespan; but when that new growth is wilting or dying, most gardeners panic, not knowing what to do. Snip a 2-inch cutting from the soft, new growth of an established plant. You should also prune any damaged or dead shoots, and trim a couple inches off of the outermost stems to encourage new growth. The best way to deal with Verticillium wilt is by getting rid of all the diseased plants and starting all over again by using new soil, new containers, and new rosemary plants. Rosemary is a woody-stemmed plant with needle-like leaves that can commonly reach 3 feet in height, eventually stretching to 5 feet in warmer climates unless clipped. Rosemary, being a relatively slow-growing evergreen, can’t shift gears as easily. Rosemary can spread to reach a width of 2 to 4 feet, so space multiple plants at least 2 feet apart to ensure good air circulation, which also helps prevent fungal growth. It might be a case of too much water drowning the roots which counterintuitively makes it difficult for the plant to move enough water to the new growth. To prune rosemary, wait until spring or early summer so there's plenty of sunshine to help the plant produce more foliage. ... and sustainability. Then, use pruning shears to trim off any dead or faded flowers. Propagating with rosemary cuttings: Remove six inches of new growth from the plant. Rosemary tolerates drying out, you don't need to keep it very moist all the time. Rosemary’s natural home is the sunny Mediterranean region where the climate is cool and wet during the winter. Rosemary plants get as big as 5 feet by 5 feet, and they do so very fast. Place under lights or on a sunny deck. Harvesting rosemary is extraordinarily beneficial to the continued growth of the plant; a practice of weekly harvesting will keep your rosemary thriving for years. Let the new plants to put on some growth before harvesting. Keep the potting soil moist until you see new growth. When harvesting, be sure to avoid any parts that look woody, as this will damage the plant. When young it is possible to keep in a small pot, but eventually it needs to be in a large container or in the ground. … Keep slightly moist but not wet. Stick the cutting vertically into a mixture of equal parts potting soil, sand, and vermiculite. The best way to keep your plant alive in Wisconsin during the winter is to leave it outside, in partial shade, when the temperature is above freezing. Remove the leaves from the bottom inch, then dip the cut tip into a rooting hormone and place the dipped end into a container of dampened, sterile seed starting mix that drains well. With a sudden new regime of lower light (even the brightest of windows is about one-tenth the intensity of outdoors) the inefficient ‘high light’ leaves can’t produce enough food for maintenance, let alone new growth. Put four inches of the cutting into the sand mixture and leave the top two inches above. New growth will continue forming on the stem. Once the plant is 6-inches tall, harvest by cutting stems as needed. Rosemary grows slowly so don’t harvest more than 1/3 of the plant at one time. In zone 8 and farther south, rosemary bushes make a good evergreen hedge. Pests: Rosemary is known to be a pest-resistant plant, but some insects can still land on this herb to live and reproduce.