Variety Library

Kingston Black

Bittersharp · 110 trees planted · confidence high

OriginEngland, Somerset (likely Kingstone near Taunton), early 1800s
Ploidydiploid
Bloom group3 (1 early … 5 late)
Harvestlate Sep-early Oct (WSU Mt Vernon bloom 5/12, harvest 9/30); mid-late Oct in England
Aciditymedium
Tanninmedium
Typical SG1.055 (13.3 Brix, WSU Mt Vernon)
Vigormoderate
Biennial tendencyhigh
Pollinator pairingHarrison

How it presents

Known as a bittersharp, but presents as a sharp in WSU cider cultivar trials, Washington, 2002–2017.

WSU cider cultivar trials, Washington · 2002–2017 means

tannin0.15%under 0.2% → not bitter
acid0.61%over 0.45% → sharp
pH 3.51 · SG 1.055 · 13.3 °Bx

Computes as sharp. The analytical method is not stated, so it is not certain the 0.2% permanganate line is the right comparison.

Multi-year means across 2002-2017. Replicate counts and per-season spread are not published, and the trial ground is not the Olympic rain shadow. Analytical method for tannin is not stated, so it is not known whether the 0.2% permanganate threshold is the right one to compare against.

WSU Cider Cultivar Performance Database

Olympic Bluffs Cidery · 98 trees · no juice recorded yet

TEST ORCHARD — fake data, safe to wipe · 8 trees · no juice recorded yet

Farm House Orchard · 4 trees · no juice recorded yet

The most celebrated English vintage-quality cider apple, emerged in Somerset in the early 1800s and possibly an open-pollinated seedling of Cap of Liberty. Cidermakers prize it as one of the very few varieties carrying enough tannin and acid together to make a complete single-varietal cider. Important local caveat: WSU-grown fruit measured only 0.15% tannin and classed as Sharp, so in this climate plan to blend it with a true bittersweet for structure.

Disease: Susceptible to apple scab and canker; notoriously erratic, low-yielding cropper that fell out of commercial UK use for this reason. WSU rates productivity only 2.7/5, among the lowest in their trial. Spreading habit, standard bearing.

Discrepancies: Class: LARS/UK sources call it bittersharp, but WSU measured 0.15% tannin and classes it Sharp - recommended SH per WSU as climate-local; treat as a mild bittersharp at best here. Bloom: pomiferous group E (mid-late, ~4) vs WSU bloom 5/12 - recommended 3 per WSU. Acid: WSU 0.61% (medium) vs MSU Montana 0.94% (high) - recommended medium per WSU marine-climate data. Canonical class corrected to bittersharp (2026-09-22): the sharp reading it previously carried came from WSU Washington trial means, which is a regional observation, not what the variety is.

Sources

  • cider.wsu.edu/ciderweb/
  • en.wikipedia.org/wiki/Kingston_Black
  • pomiferous.com/applebyname/kingston-black-id-3761