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