I don't know whether it would or not, but I wouldn't do it, because the flower spikes are so fascinating and part of the plant's appeal IMO. Giving tons of water and a well-rotted manure mulch is probably very beneficial!
We have 3 plants and every year just as the leaves are developing they get hit by the frosts and then take a time to get going again. We leave the flowers on as they are also part of the architecture of the plant.
One benefit of keeping the flower spikes on - it makes it far easier to identify if your gunnera is a manicata or a tinctoria. As mine have both flowered for the first time this spring, I've now realised I have one of each!
Growing tropical and desert plants outdoors in West Yorkshire INSTAGRAM/ YOUTUBE
Posts
INSTAGRAM/ YOUTUBE