Rue or Ruta Graveolens is a perennial herb with a small, shrub-like growth habit. It features blue-green foliage with a fern-like appearance. And in the summertime, it sports clusters of small yellow flowers that attract butterflies and other pollinators to the garden. Be aware that despite their use as a medicinal herb, rue leaves are toxic both to people and pets. Idoor: Sow thinly in a lightweight soil mix. Cover twice seeds thickness with soil. Press firmly and water. Keep evenly moist but not soggy. As seedlings appear, gradually expose them to light. When large enough to handle, transplant to pots. Harden by gradual exposure to outdoor conditions. After spring frosts transplant to garden 30-90cm (12-36in) apart. Outdoor:After spring frosts sow thinly to garden 30-90cm (12-36in) apart. Cover 3 times thier diameter with soil. Thin to 20-50cm (8-20in) apart.