What to do about blackened canes on roses? One trick to solve it easily

0002. What to do when a rose cane turns black? One trick to solve it!

The day before yesterday, a gardening friend asked Lanyao, saying that their rose canes had turned black, and they didn't know the cause or how to deal with it.

Have you ever come across blackened canes on roses? Today Lanyao will talk about the causes of blackened rose canes and how to deal with them.

Causes of blackened canes on roses

Blackened canes on roses are a diseased state, which is why we call it black rot.

Black rot occurs most often in summer and early autumn, and is mainly caused by improper fertilizing and infection by pathogens. We deal with different black cane situations in different ways.

Black rot from the bottom up

Black canes from the bottom up mainly occur in the hot summer weather, when roses are mostly in a dormant or semi-dormant state and have very little need for fertilizer and water. If you fertilize roses at this time, it easily causes fertilizer burn, damages the root system of the rose, and then shows up as black canes.

Because this kind of bottom-up black cane starts from the roots, it is more troublesome to deal with, and the entire rose needs to be taken out of the pot and have its roots washed.

Then clean up the black rot area thoroughly, soak it in carbendazim solution for disinfection, then soak it in rooting powder, and replant it in clean soil.

The whole process is quite a test, and for beginner gardening friends the success rate is relatively low.

That covers the bottom-up black cane situation; the other situation is easier to deal with.

Top-down black canes

Top-down black canes on roses are mostly caused by infection with pathogens, or by canes becoming excessively old, or by being in a poorly ventilated environment.

For top-down black canes on roses, the treatment is very simple: just cut off the blackened cane completely.

Note that when cutting, you must also cut off about 5cm of healthy cane along with it. Don't be reluctant; if you don't cut thoroughly, the black cane will appear again, so you must be ruthless and completely eliminate the source of the disease.

Note:

It is worth noting that there is another top-down black cane situation on roses that does not need treatment: if a newly transplanted rose develops a top-down black cane, then no treatment is needed, as this is a normal phenomenon while the rose is acclimating.

If you still have questions about blackened canes on roses, you can leave a message for Lanyao below, and we can discuss and improve together.

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