Bracken fern is very common, growing along roadsides, in fields, in light bush areas and even gardens. In the spring 'fiddleheads' unfurl into triangular fronds up to 3ft (1m) high. I've had horses snatch a mouthful of fern while riding and they seem to find it palatable. Bracken fern dried and baled into hay is still toxic. If a horse eats a large quantity of this fern the toxins can cause a Vitamin B1 deficiency.
Symptoms of bracken fern poisoning may include:
- loss of coordination
- depressed heart rate
- arrhythmia
- weight loss
- eventual death if not promptly treated
If you suspect poisoning from any plant or substance call your veterinarian immediately.