This very strange mix of British indie drama and plant-based psychological horror was a very odd viewing experience, it has a very effective and chilly atmosphere and strong lead performances (especially from lead Emily Beecham) but the mashing together of these two distinct styles doesn’t really work. Much as the Day of the Triffids style plant horror could be quite effective on its own it’s dragged down by a very generic ” single mother looks after her son whilst falling for a new man” plot (Ben Wishaw) plot. The third act very clumsy uses the son’s exposure to the aggressive and confrontational effects of the plant pollen as a metaphor for his own puberty. It’s a real shame. There’s a very effective psychological thriller/horror somewhere within here but the film as it exists in this cut certainly isn’t it.