Thalictrum aquilegifolium Thundercloud - Meadow-rue

Thalictrum aquilegifolium Thundercloud' is a variety of Meadow Rue whose appearance evokes that of a tall paniculate Gypsophila. This superb semi-shade perennial develops very airy flower stalks, crowned with large mauve inflorescences that have a moss-like appearance. They are composed of small flowers with numerous very showy stamens, giving them a fluffy and velvety pompom-like aspect. Carried by purple stems, they are adorned with finely cut green-blue-silver foliage that strongly resembles that of Columbine. This Meadow Rue is a hardy, robust, and undemanding plant, ideal for structuring the back of borders with a light touch.

Native to damp and shady mountain meadows in Europe and Asia, Meadow Rue belongs to the family of Ranunculaceae, like anemones, clematis, and Columbines. This tall herbaceous perennial forms an upright clump, reaching a height of 90 cm (35in) to 1.10 m (4ft) and a width of 40 cm (16in). Sometimes slow to establish, its beauty is worth the wait.

The 'Thundercloud' variety, from which it originates, is distinguished by its beautiful dense tufted mauve-lilac flowering, with a very velvety appearance. Its green-blue leaves, 15 to 30 cm (6 to 12in) long, are divided into obovate leaflets on either side of the central vein and have undulate edges. The resemblance to the foliage of garden Columbines is quite striking. Appearing in late spring or early summer, the flowers are organized in large paniculate clusters, 18 cm (7in) in diameter,  forming clouds of fluffy flowers. The spherical flowers, 8 to 10 mm (0.5 in) wide, are mostly composed of long radiating stamens, offering a tender and poetic spectacle from June to July. The dark purple stems that carry them are strong enough to not require staking.

It is in the middle or back of borders that this Meadow Rue will find its place. The flowering stems of the Meadow Rue are perfect for creating summer displays, with roses or peonies. It thrives in sunny or semi-shaded areas of the garden. A fresh and deep soil allows it to grow vigorously, but it is not afraid of summer heat, as long as it is watered occasionally in the late afternoon. It pairs well with lilies, as well as ferns, hostas, bellflowers, meadowsweets, hybrid butterbur, and perennial geraniums.

Tip: Dare to go tall with these giant plants that add structure and volume to the garden. The tallest ones, when isolated, will provide volume and lightness against a dark background of hedges or conifers. Those of intermediate size will compliment tall borders, such as those with giant dahlias.