Ever since I posted about this unusual Bidens almost exactly a year ago, I have noticed that it keeps showing up in the ‘top posts & pages’ so readers are obviously interested in it and how it performs. I thought it was late to flower last year because I had grown it from seed in March and it was going to need several months to attain it’s height and maturity. When it did flower it was stunning in it’s simplicity. Dainty and delicate white tipped canary yellow flowers on tall wiry stems. Frankly, when it died away last winter I didn’t expect it to re-appear, and so I was delighted when it did. Bidens is not generally considered to be hardy but this variety is reckoned to be hardier than most.
It was probably due to the very cold and wet spring this year but it took forever to appear and it was the end of May before I noticed any new growth. However, I was delighted to see far more growth than just the three plants from 2012. It had spread several feet and now covered an area 1 metre across. This fresh young growth sat reluctantly through spring and didn’t do very much until the end of July when it suddenly took off and the first flowers finally appeared at the end of August, exactly the same as last year!
If anything, I think it might be slightly shorter this year which may be due to the horrible clay soil it sits in and the corresponding lack of nutrients but the foliage colour is a good dark green and it looks very healthy. The flowers, three or four at the top of each stem, open successively and seem to last a week or so before the next bud opens.
If it spreads again next year I may have to re-classify it as invasive because, as much as I like it, I don’t want it to take over the border. It is already swamping a few things so a bit of division is called for next year. A number of visitors from our horticultural society have asked for a piece so it will end up in several more gardens.
A plant I can heartily recommend. If only it was scented!