Horseradish, which looks somwhat similar to a dock?
Scale insects don't infect the soil but I would mix some blood, fish and bone into the soil according to the directions on the pack to feed the soil before planting another one.
It's one of the black sambucus (elder), possibly this one:
The white flecks are dead aphids (blackfly) and he black flecks are the live ones. Blast them off with the spray attachment on a hose. If you hang a bird feeder nearby, you may attract tits etc which will eat them for you.
Last edited: 28 May 2017 18:23:24
They look like forget-me-nots.
It's called fasciation - there are some others in this thread:
I'm pretty certain that's elder (sambucus nigra) but not sure where the 'prickly' come in.
Do the leaves smell pungent when crushed in your fingers? If so, it's definitely that.
Last edited: 28 May 2017 12:53:35
Yes, could well be. They also look a bit like my jerusalem artichokes which are in the same family but I'd go with heliopsis.
I'd put it in the shadiest part of your greenhouse, if you have such an area. It's an F1 variety so will be quite vigorous. Make sure you keep picking the fruit when it is ready as any left on too long can stop the plant from producing more flowers.
It's an outdoor type but can also be grown in a greenhouse.
Looks like a Japanese winter squash called Kabocha: