'King Alfred' was raised in England in 1899 and for most of the twentieth century it was simply the daffodil. The flower is a large golden trumpet on a 16 to 18 inch stem, a shade deeper than the modern yellows and a little more open in the trumpet. True stock is scarce now, and much of what is sold under the name is 'Dutch Master' or a similar modern trumpet; buy from a supplier who says which you are getting.
Grow it as you would any trumpet daffodil: full sun or light shade, good drainage, bulbs planted at three times their depth in autumn, foliage left to die back on its own.
Botrytis (grey mould)
Grey fuzzy mould on petals and stems, worst in cool wet conditions.
Remove affected parts immediately. Improve air circulation. Avoid overhead watering. Apply copper fungicide if severe.
Narcissus Basal Rot
Brown rot starting at the base of the bulb, spreading upward; soft, decaying tissue and stunted or failed growth in spring. Fungal growth may appear pink or white.
Discard infected bulbs. Plant only firm, healthy bulbs in well-draining soil. Avoid hot, wet conditions during summer dormancy and rotate planting sites.
Narcissus Yellow Stripe Virus
Yellow or pale streaks running lengthwise along leaves; distorted foliage and reduced flower size or vigor over successive years.
No cure. Remove and destroy infected plants. Control aphids, which spread the virus, and buy certified virus-free bulbs.