Ranunculus asiaticus aka Persian Buttercup

Ranunculus asiaticus is known as Persian buttercup or garden ranunculus. It belongs to the buttercup family, Ranunculaceae. Its native range runs from the southern Aegean islands to Iran. This range includes western and southwestern parts of Iran. It is a tuberous perennial with soft, leafy growth. Gardeners also grow it as an annual or container plant. Its leaves die back, and it rests during summer.

The RHS gives a height and spread of 0.3–1.6 feet [0.1–0.5 metres]. NC State lists larger plants, reaching 2 feet [0.6 metres] both ways. The plant has a bushy form with upright flowering stems. Its green leaves grow on long stalks and have deep lobes. They have a thin, papery feel and alternate along the stems. Branched flower stems carry one to four blooms. The single flowers form cups with dark centres. They may be red, pink, yellow, or white. Bloom comes in late spring and early summer. The fruit forms a cluster of small, dry achenes.

Grow this plant in full sun with shelter from exposure. It suits loam or sand with good drainage. The soil can be acid, neutral, or alkaline. It needs moisture while growing, but a dry summer rest. The RHS favours containers kept under glass without added heat. Its suggested mix contains equal shares of loam, leaf mould, and grit. Good light and airflow matter in this setting. The RHS rates it H4 for UK hardiness. NC State lists USDA zones 8–10. Plants may take two to five years to reach full size.

Persian buttercup suits beds, borders, and pots on patios. It also fits courtyard and gravel gardens. Its flowers work well for cutting and attract pollinators. Removing spent blooms can help the plant produce more flowers. It needs no routine pruning. Grow new plants from ripe seed in a cold frame. Divide plants in spring or autumn. Aphids, slugs, and snails may attack it. Powdery mildew can affect the leaves. Wet soil with poor drainage can lead to root rot.

This plant is harmful to people and pets if eaten. Eating it can cause mouth pain, vomiting, and stomach upset. Its sap can cause red skin, burning, and blisters. Wear gloves and protective clothing when handling it. Do not treat its flowers, leaves, or roots as food.