SYCAMORE seedlings can be seen at this time of year and are slender, five to 20 centimetres tall, with opposite pinnate first leaves. Look for thin reddish stems arising from a central taproot, often in drifts beneath parent trees where samaras accumulated.

Sycamore seeds are paired winged samaras (“helicopters”) about two to three centimetres long each wing, key-coloured brown to tan when mature; they hang in clusters from branches and spin down when released.

When to watch in Ireland: Seedlings commonly emerge around now (March to May) after winter dormancy, with some autumn germination possible after rainy mild winters. Mature samaras/helicopters are produced and drop mainly September to December; this is the highest risk period for horses.

Field management for horse safety: Inspect paddocks regularly from autumn to early winter and remove falling samaras promptly. Rake or vacuum up drifts under trees, hedges and gateways. Mow and clear before seed set where feasible. Pull or hoe out seedlings when small (easier removal, prevent establishment).

Fence off or avoid grazing under sycamore canopies and around seed traps (ditches). Provide good supplementary forage to reduce browsing.

Dispose of collected seeds or seedlings securely (burn or sealed bin).

If unsure or if horses show muscle weakness/dark urine, call a vet immediately.