Is it my imagination, or is the Celandine particularly rampant this year?
This is a very difficult weed to deal with, mainly because of the small tubers that form under the soil at the base, and that tend to break off and lose themselves in the soil when you dig up the plants.
You can see these in the picture to the right. The RHS refers to these tubers as ‘tubercles’, which sounds a bit like a disease. And I can tell you that, faced with a patch of ground that’s covered in Celandine, it feels a bit like a disease too! You can never dig all of them out without leaving some of the tubercles behind, and if you’re not careful, by digging, you can turn a small colony into an infestation.
Mulching may well be the best organic approach to control. The RHS recommends a 10cm layer of organic material, but warns that this may not fully eradicate them. Membrane, with organic material over the top might be more effective. Although I know of at least one garden that has been mulched with heavy plastic, with gravel over the top (not my doing) where the celandine is pushing up forcibly around the edges, and at the base of the roses that were planted through the plastic.
If you’re happy to poison your soil, you could always douse the effected areas with glyphosate every spring.
The RHS encyclopaedia says Celandine is ‘good for a wild garden’. I must admit I’m a bit prejudiced against that because, with a few notable exceptions (such as Daffodils), yellow isn’t my favourite colour in the garden. But perhaps we shouldn’t get too worked up about this little plant. It’s easy to panic when you see a carpet of the stuff where you’d intended to have cultivated plants. But Celandine provides good ground cover, colour (albeit yellow) at a time when that can be in short supply, and by early summer it’s died back so as you’d never know it had been there. Maybe the easiest option is to learn to love it!