Do you have very hard water by any chance, or put soluble fertiliser in the water when you watered them in? There are similar marks on the container so I suspect it's not a disease.
Doncaster, South Yorkshire. Soil type: sandy, well-drained
That’s what it is. No harm done … except that tomato feed encourages flowering and fruiting and you don’t want your broccoli to flower until next spring … so don’t use it again.
Gardening in Central Norfolk on improved gritty moraine over chalk ... free-draining.
It’s not dead … but don’t feed it … at least, not until you’ve told us what it’s planted in and we’ve told you whether it needs feeding or not, and what with.
Gardening in Central Norfolk on improved gritty moraine over chalk ... free-draining.
The marks can be avoided by taking the rose off the watering can and watering the compost/soil at the base of the plant (that's the best way for pretty much everything).
Doncaster, South Yorkshire. Soil type: sandy, well-drained
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Gardening in Central Norfolk on improved gritty moraine over chalk ... free-draining.
Gardening in Central Norfolk on improved gritty moraine over chalk ... free-draining.
Gardening in Central Norfolk on improved gritty moraine over chalk ... free-draining.