Honestly, I don’t know why for sure. The brown spots at the tips of the leaves are evidence of over watering, under watering, or sun scald. If brown spots appear on the reverse sides of the leaves, take steps right away to protect your pretty plant. I think you'll find some helpful tips here that apply to a wide range of plant problems like leaf drop, brown tips, failure to grow, yellow leaves, pests, etc. A small brown spot has also appeared on the plant. Two of the runners has most of their leaves left on it. I hope these tips have helped you out. If the leaves are yellow & a bit mushy, then you’re overwatering. in regular house plants, i notice greying of the leaves in my hoya and succulents, they just looked sickly. Check your Hoya plant occasionally for dead leaves, which usually appear wilted, yellowish, or brown. If they have black tips or the whole root is black or brown and mushy, the Hoya has root rot. They usually measure between 1.5 to 6.5mm. The spots tend to be circular with dark brown margins and tan or greyish centers. It was doing fine until recently when it has started to turn yellow. My hoya kerrii has 2 new leaves! The low-maintenance hoya grows well in sunny areas indoors or partially shady areas outdoors in U.S. Department of Agriculture plant hardiness zones 9 to 11. This happened to me too! #hoya #houseplants It could also be due to a nitrogen deficiency. The Hoya kerrii is a cool-looking houseplant due to its heart-shaped leaves and low maintenance requirements.The heart leaves on this species of Hoya are the reason why this plant has common names such as sweetheart plant, lucky-heart plant, and love heart plant.Leaf cuttings growing in small pots are popular gifts on Valentine’s Day to symbolize love and devotion. The leaves are green and the flowers are striking in creams, pinks, purples or whites. Any new growth is stunted or stopped entirely. People have asked me about yellow leaves on Hoyas. If the leaves continue to turn yellow and drop, turn the container on its side and gently slide the Hoya out of the container. The leaf blades will turn yellow, beginning with the older leaves. But… one leaf turned yellow and fell off. The leaves will eventually turn a garish blue green, then purple mottled with brown and yellow. The succulent has attractive, waxy leaves. With a potassium deficiency the leaf tips and edges turn tan, bronze or sometimes even dull red, followed by crinkled, burned leaf edges. The genus Hoya or wax plant consists of over 200 species. The leaves and flowers are covered in a waxy substance, giving the plant its name. But out of my 17 new leaves, only 4 of them fell off this way, so I’m not concerned at all. The other one is still on the plant but way darker than the other leaves. Too much water for these succulents can lead to root rot (a fungus that grows in the soil.) As the name suggests, leaf septoria is characterized by yellow and brown spots forming on both the upper and lower sides of leaves. The wax plant can be a houseplant, perennial or shrub. Shake the potting soil off the roots to get a good look at them. so i did my own study, giving each test group exactly the same food and environment, 10 x 1000w super growlux hps bulbs, co2, bleeder system, and advanced nutrients plant food, and food grade hydrogen peroxide. The stem has turn brown, not for sure if they are complete dead, because there is still a few soft leaves on it. Hi everyone I am a newbie to gardening and have bought one of these single-leaf Hoya Kerrii plants (heart-shaped) about 8 month ago. My Variegated Hoya occasionally gets yellow leaves because it’s about 6 years old now, grows very full & that’s what happens as they age. X Research source Prune these away, as well as any other cosmetic pruning you choose to do. 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