German chamomile is one of the most useful plants in the cutting garden — the daisy-like flowers with their golden centres are a natural filler in any arrangement, and the apple-honey scent carries through the whole. It's fast, it's generous, and it self-seeds so reliably that once you grow it, it tends to find its own way back.
Sow direct in earliest spring — it germinates in cool soil and handles frost without complaint. Like cosmos, it flowers better in poor soil; give it too much fertility and you get lush growth with fewer blooms. Cut regularly to keep the plant producing; let a few heads go to seed and you'll have volunteers every year after.
Aphids
Clusters of small soft insects on new growth and flower buds.
Knock off with a strong jet of water. Ladybirds and lacewings are natural predators. Insecticidal soap as last resort.