About Sea Holly
Sea holly is a striking perennial known for its small, spiky, thistle-like flowers in shades of blue, silver, or green. Its unique appearance and tolerance for dry, sandy soils make it a favorite in coastal and xeriscape gardens. Their unique color and shape have made them the darling of high-end florists who appreciate the beautiful texture and interest they bring to fresh flower arrangements.
When to Plant Sea Holly Roots
Plant your sea holly roots in the spring after all danger of frost has passed and the ground has thawed.
Where to Plant Sea Holly Roots
Choose your site carefully, as sea holly is a tap rooted plant and does not like to be transplanted. Pick a location with sandy, well-drained soil where it can thrive in dry and even poor soils. Avoid heavy or waterlogged soils as sea holly simply will not grow there. If your soil is heavy, amend it with sand or gravel to improve drainage. Sea Holly is an exceptionally carefree plant if given a well-chosen site.
Plant sea holly in full sun for the best color and flower production. This plant is ideal for xeriscaping, as it requires minimal water and attention once established.
How to Plant Sea Holly Roots
Dig a hole about four to six inches deep and wide enough for the roots to spread comfortably. Position the roots in the hole with the crown at or just below the soil surface. Cover the roots with soil, gently firming it down to remove air pockets. Water lightly to settle the soil, but avoid overwatering.
New growth should appear within two to four weeks after planting.
How to Care for Sea Holly
Sea holly typically blooms in mid to late summer, producing long-lasting flowers that are also excellent for cutting or drying.
Water regularly during the first growing season to establish roots. Afterward, sea holly requires very little water. Fertilization is generally unnecessary as sea holly thrives in lean, poor to moderately fertile soils. Applying too much fertilizer can actually reduce flower production. Deadheading flowers will extend the bloom period and maintain a tidy appearance. Sea Holly is hardy in zones 4 through 9 but will need winter protection. In colder zones, apply mulch after the ground freezes to protect the roots.
Sea holly is relatively pest- and disease-resistant.
Divide the plant every three to four years in early spring to rejuvenate and propagate new plants.