Acorn Gathering
Acorn Caps and Damage: What to Discard
Short answer: Discard acorns with holes, cracks, soft spots, mould, or a hollow feel, and discard caps separately, since caps are not part of the nut. A small hole often means insect damage inside, even if the outside looks mostly sound.
How do you check this?
Run a strict eye over every acorn before it earns drying space. Holes, cracks, soft spots, mould, and a hollow feel all mean discard, and a small hole deserves suspicion rather than benefit of the doubt, since it often means insect damage inside a shell that looks mostly sound. Caps go separately: they are not part of the nut, and keeping them only confuses the sort.
The points that matter
- Holes mean inspect closely and usually discard.
- Soft or mouldy nuts go out, not into storage.
- If you doubt a nut, leave it out.
Caps: useful clues, not part of the nut
Caps belong in a separate pile from the start, because they are not part of the nut and keeping them mixed in only confuses sorting, drying and storage. A cap can still be useful as a clue, since its shape and the way it parted from the nut help with identification, but that clue is recorded by noting the tree, not by storing caps with nuts. Once caps are separated, the nuts themselves can be judged on shell condition alone.
Holes and what a small hole can hide
A small hole deserves suspicion rather than benefit of the doubt, because it often marks insect damage inside a shell that looks mostly sound from outside. Hold the nut up, look closely at the hole shape and edge, and feel for lightness or hollowness that would confirm poor filling. When doubt remains, discard the nut, since one doubtful nut is never worth risking a drying tray or a storage container.
Check holed nuts against the rest of the batch, because a few holes may be isolated while many holes suggest a tree or a season with heavy insect activity. Recording the proportion helps next year, when you can compare trees and decide where to gather first. Sorting strictly at this stage is a form of record keeping as well as quality control.
Cracks, soft spots and mould
Cracks let moisture and mould into the interior, soft spots show that decay has already begun, and visible mould shows that decay is established, so all three mean discard without debate. Do not try to cut away a mouldy patch and keep the rest, since mould in a nut usually runs deeper than the surface mark suggests. A nut that is soft when pressed gently has already lost the firmness that sound nuts keep through drying.
Separate suspect nuts into a discard container as you sort, rather than leaving them on the table where they might be mixed back in. A clear discard pile prevents the common error of rechecking a doubtful nut later and talking yourself into keeping it. Strictness here is quick, while leniency creates work at every later stage.
The doubt rule and batch protection
If you doubt a nut, leave it out, because that simple rule protects the whole batch more reliably than any attempt to judge borderline nuts one by one. Borderline nuts consume attention, occupy drying space and can spoil neighbours, while their contribution to the final harvest is small. A batch from which doubtful nuts have been removed is easier to dry, easier to store and easier to trust at preparation.
Apply the doubt rule consistently, even when a batch is small and every nut feels precious. A small batch of sound nuts is more useful than a larger batch mixed with doubtful ones, and the discipline of discarding teaches faster identification of faults next season. Over time your eye will sharpen, and the number of doubtful nuts will fall because your gathering choices improve.
Frequently asked questions
Why should caps be discarded separately rather than left on?
Caps are not part of the nut, and leaving them on confuses sorting, hides shell faults and occupies drying space that sound nuts need. Removing caps first lets you inspect the shell properly, run a fair float test and spread nuts in a true single layer. Discard caps in a separate pile so that sorted nuts stay clean and easy to handle.
Does every hole mean insect damage?
Not every hole has the same cause, but a hole is a strong warning that the interior may be damaged, hollow or poorly filled, and it should usually lead to discard. A small round hole in particular often marks insect entry, while irregular damage may come from handling or decay. In either case the nut has lost the intact shell that protects it, so keeping it risks the batch.
Can a cracked acorn still be dried and used?
A cracked acorn is a poor candidate for drying and storage, because the crack admits moisture and mould and the interior is no longer protected. Drying a cracked nut alongside sound nuts also risks spreading mould to neighbours. Discard cracked nuts at sorting, and reserve drying space for nuts with complete, firm shells.
What comes next?
Strict sorting at this stage protects the whole batch.