Flower and bulb growers say uncertainty around any Brexit deal is their "biggest issue" at the moment.
UK and EU officials announced on Sunday that trade deal talks would continue as no agreement had been reached.
PM Boris Johnson warned the sides remained "very far apart" in key areas, but "where there's life there's hope".
Diane Collison, from Collison Cut Flowers in King's Lynn, Norfolk, said whatever the outcome "there will be a lot more that we need to do".
A new deadline for a decision on UK/EU trade talks has not been set - but the ultimate deadline comes on 31 December, when the UK stops following EU trading rules.