Aphids on my Sambucus
I have three beautiful Sambucus but one seems to be invaded by black aphids. I haven’t come across this before so I have sprayed it with washing up liquid and water. Will this be enough? I read somewhere that adding a touch of Cayenne to the liquid is also good but they are just about to flower so I don’t want to do any damage. I’m not keen on chemical solutions. Any suggestions would be very welcome.