Yellow rattle: flowers and ripe seedpods
I came across a clump of a really pleasing new plant recently: Rhinanthus minor or yellow rattle. I sowed some near the orchard area, but none have appeared there. These ones appeared right down by the river on the north corner of the tree field near near where I coppiced the alder earlier in the year. There seems to be a number of plants judging by the size of the clump, so it may have been seeding around for a few years unnoticed. It wasn’t the flowers I noticed first, but the seedheads, which are a line of small inflated bladders.
Yellow rattle is a annual plant, so needs to resow itself every year. It is semi-parasitic on grasses and other plants. By reducing the vigour of grasses it enables a wider range of meadow flowers to grow. The historic practise of cutting hay for winter feed suits it’s lifecycle. When the seed is ripe they rattle in the bladders in the wind and the farmers knew it was time to cut the hay. The seeds readily fall out, or are added with the ripe hay as supplementary feed into other meadows. They need to overwinter before germinating, but have a short viability, so need to grow and set seed successfully in order to propagate. How they seem to have managed to survive in the sheep field previously I don’t know!
Since some of the seed is already ripe, I have been spreading it along the trackways a bit. If we manage to cut the grass properly in the autumn, this will expose the soil a bit (which is important to enable successful growth). We can cut just a strip of narrow path to walk along again next year and the rattle (hopefully) can grow in the rest of the trackway, set seed and be cut in autumn again. I’ll save some seed to scatter after the grass is cut this year as well.
When I read up about yellow rattle I was excited by the possibility of it reducing the vigour of couchgrass, but unfortunately it doesn’t like couch grass or other very vigorous grasses which swamp it. However it is a happy addition to the flora and hopefully will increase the diversity of wildflowers in the tree field further.