How to use online tree atlas tools to find new collection sites

Online tree atlas tools can turn a vague ambition—collecting more seed—into a map of places worth checking. By combining species records, topography, canopy imagery and community observations, volunteers can identify gaps without treating every mapped tree as an automatic collection target. The result should be a short, defensible shortlist that can be verified on the ground.

That distinction matters for Growing Native, whose volunteers collect native hardwood and shrub seeds, including acorns and walnuts, for donation to state nurseries and streamside restoration in the Potomac River watershed. A map may show that a species occurs nearby, but it cannot prove that a tree is native to the site, safe to visit, suitable for collection or absent from an existing collection network.

Australian readers can adapt the same method for local nurseries, Landcare groups and Bushcare projects. Records from the Potomac watershed should not validate Australian sites, so use Australian species and government datasets instead. River red gums, swamp she-oaks, wattles and Tasmania’s cooler-forest species require local timing, permissions and collection methods.

Build a Species-Focused Search Area

Begin with a species brief rather than a general map. List the trees or shrubs you want to collect, their identifying features, suitable habitats, expected fruiting seasons and any known disease risks. For Growing Native, this might focus on native oaks, walnuts and understorey shrubs suited to particular parts of the Potomac watershed. An Australian equivalent could centre on a river red gum population along the Murray–Darling floodplains or a blackwood stand in a Tasmanian catchment.

Use an online atlas to define the initial geography. The Atlas of Living Australia, Global Biodiversity Information Facility, iNaturalist and state forestry inventories can each reveal where a species has been recorded. Filter by species, date and map boundary, then note the density and distribution of observations. A cluster near a creek may be more useful than isolated records spread across the map, while a conspicuous gap may identify an area worth checking.

Treat every pin as a lead rather than evidence. Community observations may include cultivated trees, old records or identification mistakes, while forestry datasets may describe broader forest types. Before relying on a location, consult Growing Native’s forest ecology resources to understand how species form, forest structure and watershed position are connected.

Separate Natural Forests from Planted Stands

Species-occurrence maps often combine native woodland with plantations, street trees, orchards and remnants of land cleared for grazing. Those planted stands can dominate the appearance of a map without providing suitable local seed. Concentrated records beside a town, along a road or near a timber plantation may indicate the source of the planting rather than the ecological origin of the species.

Historical land management can also distort present distributions. Growing Native’s account of Appalachian silviculture history shows how logging and artificial regeneration altered forests across the eastern United States. Australian users will recognise the pattern in some commercial eucalypt plantations: evenly spaced trees, straight boundaries and uniform age can look convincing from above but may have little genetic relevance to a nearby remnant.

Look for spatial clues that support a natural population. Native remnants may occupy a slope, floodplain pocket or sheltered gully rather than following property boundaries. Check for mixed ages, irregular spacing, nearby seedlings and an understorey consistent with older woodland. Aerial imagery is particularly useful for spotting plantation geometry, recent clearing and regeneration areas.

Compare Layers Before Choosing Sites

A reliable shortlist comes from comparing several kinds of evidence. No single map can show species identity, landform, canopy condition, ownership and safe access at once. Overlaying the available layers helps distinguish a promising population from a convenient-looking location that fails on closer inspection.

Evidence layer	What it contributes	Key planning question	Main limitation
Species records	Confirmed or reported locations	Where has the species been documented?	Records may be old, cultivated or misidentified
Topographic maps	Elevation, slope, drainage and aspect	Does the landform suit the target species?	They show terrain, not current vegetation
Aerial imagery	Canopy gaps, roads, clearings and planting patterns	Is there accessible woodland to inspect?	Imagery may be outdated or seasonally misleading
Community observations	Dates, abundance and local knowledge	What have recent observers recorded?	Verification standards vary
Soil and climate layers	Rainfall, temperature and growing conditions	Does the local environment support seed production?	Detail may be too coarse for individual trees

After comparing the layers, rank sites by the strength of their combined evidence. Give priority to well-documented natural populations near suitable habitat, rather than simply choosing the most northerly or accessible point. In Australian project talk, sites are often identified by their catchment, reserve or local Landcare group, so include those names in your notes.

Remember that “new” means unconfirmed by the current network, not necessarily untouched land. A site may have healthy trees yet no recorded seed collection, or it may already contribute to restoration. Check existing collection records and local nursery orders before planning another visit. Urban bushland in Melbourne’s Yarra catchment, for example, may appear on a general species map but still require council permission and careful checks for previous collecting.

Verify Access, Stewardship and Seed Quality

Permissions and safety checks belong in the planning stage, not after arrival. Australian collection rules vary by state and territory, and local council, reserve manager or landholder approval may also be required. Contact the relevant authority before promising a collection date. Biosecurity, fire danger, flood conditions and restricted access can change a suitable field day into an unsuitable one.

Use a field checklist to make each visit consistent:

Match the target species to the correct catchment, landform and local distribution.
Confirm that the population is naturally occurring rather than cultivated or planted.
Check whether trees are healthy, mature and producing sound, undamaged seed.
Record safe access, parking, gates, hazards and the responsible land contact.
Document dates, photographs and precise observations for future atlas updates.

Bring the field identification skills needed to distinguish look-alike species, and clean footwear and tools between sites to prevent the spread of weed seeds or pathogens. Do not collect from trees affected by serious disease, isolated individuals, culturally sensitive locations or places without secure permission. If an area cannot be verified safely, leave it for a later visit rather than forcing a collection.

Seed handling should also reflect ecological responsibility. Collect only the quantity needed, avoid stripping an entire small population and follow local protocols for drying, labelling and storage. Australian native seed often moves through local nurseries, council bushland programs, Landcare networks and regional propagation facilities rather than through one central buyer, so clarify who will receive it before collection begins.

Create a Practical Collection Plan

Turn the verified shortlist into a route with clear priorities. Give each location an evidence score, expected collection window and fallback point. Assign volunteers to record identification, habitat condition and seed quantity, while one person handles permissions and nursery coordination. For projects in the Potomac watershed, coordinate species and quantities with Growing Native so collected seed reaches the appropriate state nurseries.

Build the schedule around local reproductive cycles rather than imported Northern Hemisphere dates. Eucalypt capsules, she-oak cones and other Australian fruits have different ripening patterns, and wet-season weather can affect both access and seed quality. In eastern Australia, dry-season heat can shorten collection windows; in Tasmania, cooler temperatures may delay ripening. Leave time for weather delays and include an alternative date when fires, floods or closures are possible.

A productive site should become a documented asset. Upload verified observations to the relevant community or government atlas, share records with the landholder, and report whether the area should be considered for future collection. Clear provenance helps nurseries and restoration teams select seed that is both genetically appropriate and ecologically relevant.