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