first batch, which was some two months ago. Let's see if I still remember what the plants were... There were more lobelias. Then a mixture of purple vetch and rose petals (those gave the Pollockian pattern at the top). A sprinkling of almost black clematis flowers. And definitely bright red poppy petals gathered in a meadow in the park, fallen after a rain. The poppies are the darkest strip on the left.
Poppies especially seem to have dyeing potential. Look at Sonia's great poppy colours here.