All of this is from information I found online and not my experience. Not all sage varieties are culinary; the most popular kitchen sage is called Salvia officinalis. Sage thrives in well-drained, slightly acidic soil and full sun or light shade. Sage grows well in zones 5-9. It forms a shrub up to 2 feet high with gray-green leaves and attractive lilac flowers. So when, on the rare occurrence, the soft perfumed leaves wilt and even shrivel, it can be alarming to the home gardener. It grows spikes of spring flowers in different colors, including purple, blue, white, and pink. It's so strange. Hello Everyone! It is a fungal disease. If left untreated, black spot spreads rapidly and weakens plants severely. There are several causes for this, one simply being old age. Sage leaves are curling under. Like rosemary (Rosmarinus officinalis), also from the Labiatae family, sage prefers a light fertilizer and for the soil pH to be between 6.0 and 7.0. How to Grow Sage Zones. The oval leaves turn vaguely purple in full sun, and the compact growth habit makes it perfect for containers or small areas. I hope it helps. I made two terrariums and the one that the leaves are turning black in gets no air (it has a solid lid). If the leaves are losing some color or turning yellow they need more light. TooManyWeeds87 Seedling. fish_4_all, Mar 12, 2010 #2. They are all turning brown from the bottom inside the bushes. What might this disease (or diseases - the mint looks like rust but I've not heard of rust affecting thyme) be, and how can I treat it? Soon the entire leaf turns yellow and falls. Hello, I am not sure if this is the right place to post about this because although it's an herb its in a terrarium. To measure the soil’s pH, you can buy a pH reader from your local garden store. Getting rid of black leaf spot must be a two-pronged attack. I planted them two years ago and they have been doing great until just recently. I haven't done anything different with them. It starts with tiny black spots on leaves, no bigger than a pinhead. Sage (Salvia officinalis) is a short-lived perennial herb grown for its aromatic leaves. As for nurseries not harding off their plants, they should have a sign posted at the register that plants should be protected for a few days before … Up until that time they grew well and flowered. Black spot leaf disease shows itself first with black spots appearing on the leaf, then with rings of yellow as the spots grow, until the leaf turns entirely yellow and then falls off. Treating Black Leaf Spot Fungus. Sage is a hardy perennial with pretty, grayish green leaves that like as good in a perennial border as they do in a vegetable garden. Powdery mildew on garden sage appears as the temperatures increase in late spring. As it develops, entire leaves will be coated with the fungus and it leads to leaf drop and deformed new growth. As the fungus develops, those black spots on leaves are ringed with yellow. Susan, the black leaves on my B&B's happend after half the growing season. Wed Aug 22, 2012 5:20 am. Common green sage is hardier than other varieties, so try growing it before any others if you don’t have an ideal climate. In the early stages, it looks like dusty white spots on the upper surface of the leaves. Sage plant turning black. I am in Houston and have about 7 Texas Sage bushes in front of my house. Sun and Soil Requirements If your sage is an adult shrub, it can withstand -30 degrees winter temperatures, if properly covered. The leaves on all my garden herbs (mint, sage, oregano, thyme, lemon balm) get yellow-brown speckles from late spring, which by late summer almost entirely cover the leaves. Sage is a perennial garden herb popular to many as an easy plant to grow. As a soil-borne fungus, it's present at all times, even deep winter. 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