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