Although my 2 year old Timperley Early rhubarb now has 3 crowns I am losing lower stems which become soft, floppy with yellowing leaves. Upper, older leaves are green & healthy but there are only about 4 of these so I don't want to pull them in case the plant loses nourishment to grow. I remove slugs & snails frequently & there is a frog about so I don't want to put down pellets. It's more the over-all health or lack of it that worries me. The other week I bought some road-side/farm 'mature compost' & put on a few inches having watered underneath first. I think I also had applied some bonemeal etc. a few months ago & there's been plenty of rain. I'm now worried that the plant may be worse for the compost & have moved some of it away from the crowns. Any ideas as to what I should be doing?