Dahlias in the Bishop series have the darkest leaves and produce an abundance of flowers through to the first frost. All are single of semi-double flowering but the colour scheme varies as many were grown from seed. Bishops Children are open centered dahlias.

Bishop of Llandaff the old favourite that found new favour after a Chelsea show (AGM 1928). They have dark bronze-green foliage and vibrant red semi-double blooms.

Bishop of York is a bright yellow with a single layer of petals.

Bishop of Leicester is a pale pink with yellow collarette in the open centre.

Bishop of Canterbury is a cerise or dark pink colour.

Bishop of Oxford is a personal favourite with a strong orange coloured bloom.

You can grow a range of dark leaved Dahlias from seeds in a packet named Bishops Children from Thompson Morgan  for £2.99. Or annual Dahlias with dark foliage Dahlia variabilis Redskin for £2.69.

You can also buy a collection of these Dahlias from the Daily Telegraph

See also Red Hot Dahlias at Gardeners Tips and Dahlias a History

Seed Cultivation Instructions
A fiery mix of such striking colour, yet with the innocent flower faces of Bishop’s Children. Mid-height, and blends extremely well into borders. However, be warned that a colour eruption may occur! Spectacular in bedding and containers, and as a cut flower.

Sow February to April. Germinate at 68-86F on the surface of a good free draining, damp seed compost. Apply a layer of compost or vermiculite, ¼in deep. Place in a propagator or seal container inside a polythene bag until after germination which usually takes 7-21 days. Do not exclude light at any stage, as this helps germination.
Growing Instructions

Transplant seedlings when large enough to handle into trays or 3in pots. Grow on in cooler, well lit conditions for 10-15 days before planting out 12-18 inches apart after all risk of frost. Will grow to a height of 24-30 inches.

Prefers a moist, well drained soil in full sun. Tubers may be lifted and overwintered frost free for use the following year.