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