Trigger plant - Stylidium graminifolium


Common name - Trigger plant
Latin - Stylidium graminifolium
Pruning - None
Frost tolerance - Heavy
Soil - Well drained
Watering - Not required. Becomes dormant in dry periods
Flowers - Spring and Summer
Summer - Flowering
Autumn -
Winter - Becomes dormant and dies back
Spring - Reshoots and begins flowering
Fertilising - Slow release low phosphorous


Tasmania has six native species of Stylidium. These are characterised by the trigger plant habit- where the flowers have the style and stamens fused together to form a column that springs across the flower when its bottom is tickled. Three species are perennial rosette plants with numerous leaves. These are the very widespread and common, S. graminifolium, which has leaves less than 3mm wide; S. dilatatum, which is common in dry places and has leaves more than 3mm wide; and S. armeria, which has thick, broad leave and short thick flowering stalks and grows on rocks in the salt spray zone of the west, south and far south-eastern coasts. The other three species are small ephemeral plants with few leaves. n.b. Stylidium inundatuam is probably not native to Tasmania (specimens previously identified as such were probably another of the ephemeral species).