Sensory descriptor
Melon
A soft, watery, faintly green tropical note from hexyl esters and residual nine-carbon aldehydes.
Also called Honeydew.
- Aroma family
- Tropical fruit
- Does it indicate a fault?
- It depends on the style it is met in
What causes it
Melon character in cider arises where hexyl acetate — the same ester that carries ripe apple — sits alongside residual traces of nine-carbon aldehydes and alcohols from the fruit’s lipoxygenase pathway, without the sharper green aldehydes that would push the perception towards apple. The balance is delicate and is favoured by cool fermentation of low-acid fruit. It is one of the descriptors most sensitive to acidity: the same volatile profile in a high-acid cider reads as green apple, and in a low-acid one as melon.
The compounds responsible
Where the molecule is established. Some descriptors in this lexicon name a compound the compound register does not yet hold a record for; those are named in the cause above instead.
Hexyl acetate
The apple-skin and pear ester that is genuinely carried in from the fruit rather than made by the yeast, and one of the few fresh-fruit aromas that survives fermentation.
Hexanal
The green-apple aldehyde generated within seconds of breaking fruit tissue, which gives fresh juice its cut-grass smell and is largely converted away by the yeast.
Malic acid
The acid of apples, which supplies almost all the sharpness a cider has and, through pH, decides how vulnerable that cider is to everything that could spoil it.
What raises it
Processes that increase this character, or preserve it where it would otherwise be lost.
Fermentation temperature control
Managing the temperature at which a ferment runs, which sets not only how fast it goes but which aromatics survive it and what the finished cider tastes of.
Cold maturation
Holding cider at low temperature so that it settles bright, sheds colloidal material and stops changing microbially, without any additive or treatment being applied.
Juice blending
Combining juices from different cultivars before fermentation so that the blend ferments as a single batch, as against fermenting separately and blending later.
Where it is usually met
Fruit and styles this character is recorded in. A record here is where the descriptor is commonly found, not a claim that every example shows it.
About Melon
Melon is a marginal descriptor and is included because it names a real perception in low-acid, cool-fermented ciders that panels otherwise record as an unhelpfully vague fruitiness.
It is worth distinguishing from residual sugar and from a general soft impression; where the specific watery-green quality is absent, a more general fruit descriptor is the honest choice.
Others in the tropical fruit family
Pineapple, mango, banana, passion fruit.
Banana
Isoamyl acetate at high concentration — the same molecule as pear drop, in different company and at a different level.
Bubblegum
A confected tropical note from acetate esters at high concentration with 2-phenylethanol behind them.
Passion fruit
A penetrating tropical-sulphur note from volatile thiols released by yeast β-lyase activity.
Pineapple
Sharp, sweet tropical fruit from short-chain ethyl esters, chiefly ethyl butanoate and ethyl hexanoate.
Mango
Soft, ripe tropical character from lactones and esters together, met in warm-climate and modern cultured ciders.
What people ask next
Questions readers ask about the things this page mentions. Each one goes to the section that answers it rather than to a page written to receive the question.
- What temperature should cider ferment at — Most cider is fermented cool, commonly between about 12 and 18 °C. Cooler ferments keep more fruit aroma and run slower; above the low twenties the cider tends towards hot, solvent-like higher alcohols.
- What is malic acid and why does it matter in cider — Malic acid is the acid of apples and supplies almost all the sharpness a cider has. It also sets pH, which decides how well sulphite works and how exposed the cider is to spoilage, so it does far more work than its taste suggests.
- What is juice blending
- How is supermarket cider made
- What is a medium dry cider
Where to go next
- The sensory model — The thirteen structural dimensions and the twenty aroma families, in full.
- Compounds — The chemistry behind the words.
- Troubleshooting — When a perception turns out to be a problem, this is where it is diagnosed.
Sources
What this page rests on. Where a source is marked as registered rather than read, CiderHQ is recording that the body is authoritative on the subject without claiming to have worked through the document itself. See our evidence policy for what each state means.
Washington State University cider research programme
Washington State University Northwestern Washington Research and Extension Center · university · passage verified 2026-08-24
The single most useful open cider dataset CiderHQ has found. The programme’s cultivar performance database gives juice chemistry, orchard behaviour, bloom and harvest timing and cider-maker tasting notes for 73 cultivars grown at one maritime site over fifteen years, and — unusually — publishes its classification thresholds alongside its figures, so the classification can be checked rather than taken on trust. It also states outright that its results diverge from the English ones. Read in full on 2026-08-24 and transcribed into `data/trials/wsu-mount-vernon.ts`; four published figures were found to be impossible and are withheld there with their reasons.
The Science of Cidermaking and associated technical writing
Andrew Lea · reference work · passage verified 2026-08-24
Written by a food chemist who worked at Long Ashton on apple phenolics. Unusual among specialist cider writing in that it is primary-research-adjacent: the author is describing work he did, and cites the literature. This is why it is registered at tier 1 for chemistry while a general cider book is not.