I have spots/discoloration on my knockout roses and on my butterfly bush.

Question

I planted about 3 weeks ago. I had the soil tested and amended it per my garden center’s instructions. I applied the Bayer advanced rose and flower care product to it 2 weeks after planting.

• 
• 
• 
• 

Answer 1

Newly planted Knock Outs don't need fertilizer right away, if at all. According to the Knock Out website, if you choose to fertilize, wait till at least one bloom cycle has concluded. Butterfly bushes don't need fertilization either unless planted in poor soil. Compost added to the soil benefits them.

They may have gotten a little too much attention right away. If it's a fungus, just be sure to pick up any fallen leaves and throw away in trash.

https://www.gardeningknowhow.com/ornamental/shrubs/butterfly-bush/butterfly-bush-care.htm
https://www.gardeningknowhow.com/ornamental/flowers/knockout-roses/care-knockout-roses.htm
https://www.gardeningknowhow.com/garden-how-to/soil-fertilizers/fertilizer-burn-in-gardens.htm