jno and Zacs, the plants will die. They are the "stock" of the business. These business will lose all of their stock, they won't be compensated for it and then they won't survive that. It's like every single one of them got flooded, without flood insurance.
The travel and leisure industries are getting special government support. The garden centre industry isn't. The article I linked to above states:
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The Horticultural Trades Association (HTA) is asking the government for financial assistance of up to £250m to help the industry avoid collapse.
It warned that up to a third of producers could go bust.
Ornamental plant growers' main assets are their inventory of plants - and they are facing a loss of nearly their entire 2020 income, according to the HTA.
As one grower put it: "My car dealer down the road is shut. However painful that will be - they will still have all their vehicles.
"At roughly the same value, in three months' time, if I'm a nursery producing seasonal plants it will be nil."