Read the evidence under an oak tree

Notice which neighbouring trees spread into the area beneath your feet. Record any acorn cups and leaves you can confidently associate with the target tree through direct observation.

Look at a fallen cup below the overlap between a rounded oak crown and a second tree. End the entry with the strongest description you can support and the thing you would like to see on a future visit. If somebody else joins you, show them the starting viewpoint and write down what each of you noticed independently. Different observations may reveal where the record needs another angle or a clearer description.

The cup's depth and roughness may carry more information if you can connect it to an intact acorn. Notice whether the irregular cases cluster around a time, a particular part of the site or a change in observation method. A bright photo taken at an angle can reveal a marking that was always there. A different viewpoint can equally hide one you had seen on every earlier visit.

Use a photograph to compare the cup depth, the texture of its outer scales and the outline of the nut. Add a ruler if you plan to use an identification key later.

A clean fallen leaf may have come from a tree further away after a gust. Give each record a date and keep the site description precise enough for you to return. A wide view is worth keeping with a detail picture. It can show that a branch is near a reflective surface, that the bank slopes away, or that a nearby tree changed the background between visits.

Photograph whole acorns in position where their branch assignment is strongest. Keep absence, uncertainty and poor visibility in separate fields. Those distinctions become important when you turn a notebook into a seasonal summary. A missed visit cannot establish whether a change happened earlier or later, but two positive sightings can set helpful limits around when it was possible.

Keep the unassigned cups in a separate group when comparing field-guide pictures. Put photographs at a similar scale before comparing them. If you used drawings or brief notes, align dates and label the landmarks you can recognise on both. Add a small mark to anything you cannot match confidently. That makes the next visit a chance to resolve a specific question rather than repeat a general look around.

Give an observation room to stay unresolved. A sketch, a time and a place can be worth keeping even when the exact name or cause is unclear. Repeated visits may close one gap and open another. When they do, use a note beside the original date so it remains possible to see how your reading changed. If you share the record, choose a photograph that shows the most informative feature you can safely see and one with wider context. Add the season, general habitat and what remained outside the frame. For a recurring observation, keep the same short fields and compare the records on their own before looking at possible explanations. An oak with two consecutive years of dropped cups may leave a mix of fresh and weathered parts under the same crown. Record the condition independently. A photograph can preserve an apparent colour shift while overlooking the surface that caused it. Inspect a shaded as well as an exposed part, and keep a wide image whenever colour might be influenced by a neighbouring wall, water or foliage. A rough sketch of the positions can establish that relationship even when the photograph is dark.

Keep uncertain finds labelled as ground observations rather than attaching them to a tree name. Observe the edge of the setting as well as its centre. The ground beyond a branch, shell or bank mark may hold a useful reference for distance or scale. A picture cropped close to the subject is valuable for comparison, while a second frame can reveal an environmental cue affecting its appearance.