Mites can be a problem. Square stems and opposite leaves with flowers borne in whorls on spikes. Winter protection needed. If too leggy cut back. Does well in sun to shade and moderately fertile soil.
Slugs can be a problem.
Good for hanging baskets. Does well in sun to shade and moderately fertile soil. Slugs can be a problem. All parts of the plant are poisonous including the water cut flowers are places in. Likes soil rich in organic matter but spreads in poor soil and under trees and shrubs.