How many zinnia seeds can be planted (after soaking) in a 6" pot? My rose plants are developing black branches and the leaves in the affected branches are drying off. What's the remedy?
Certified GKH Gardening Expert
I would put at least two to three per pot and thin out later as needed. This should ensure that at least one germinates. The rose sounds as if it may be affected by sooty mold. It happens when the plant gets a pest infestation. I would recommend using neem oil, as this will get rid of the sooty mold fungus and kill the pests. Here is some articles that will help you: https://www.gardeningknowhow.com/plant-problems/disease/how-to-get-rid-of-sooty-mold.htm, https://www.gardeningknowhow.com/problems/pests/neem-oil-uses.htm