Erect, annual, hairless parasitic herb. Growing upton 50cm in height. The leaves are narrow-lanceolate, coarsely toothed and slightly wrinkled on the outed edge, stalkless and arranged in opposite pairs. Flowers are situated in short leafy spikes.
Ideal Sowing Time
Sowing should ideally be performed in the autumn, the seeds require a special treatment known as stratification or vernalisation.This means the seeds require a period of prolonged cold to trigger germination.
Once the seed has ripened, they are shed into an enlarged calyx, which forms the 'rattle'. Eventually the seeds are shaken out of the calyx onto the ground. The seed is a lightweight disc, very thin but wide (4mm).
Each Flower has a flattened calyx that becomes inflated. Corolla is yellow and two-lipped; the upper lip has two short teeth and the lower lip is three-lobed.
Flowers between May-September.
Works well withRecently, yellow rattle has been widely used in wild-flower mixtures to suppress vigorous grasses and give wild flowers a chance.