Politics is not some metaphor. It is about the action by the government more than by the citizens'.
Science is not some metaphor, either. It is a set of different rules of the universe from what governs politics. While human recognition can be affected by politics, the scientific laws of the universe should not be influenced by governing principles.
The plant's growth is not some symbol of the government's actions. The scientific law says, its welfare is not affected by politics. That is, your vegetables do not die off even if the government sets out some stricter seed patent laws. It only says that some seed companies like Monsanto pay off the lawmakers that set out situations that your plants be affected.
The law of the universe, the scientific laws supersedes in this case about the growth of plants. It is simply a gimmick if it does not appear so. There is no freedom if you need powerful political backups for growing your house plants, not even for sale.
It is only the sales part that the politics should come into play, not plant growth.