To rank plants from least to most desirable, one must consider the context and criteria such as ecological value, hardiness, or aesthetic appeal. Without a specific table or data set, general rankings can be made based on common desirability factors like ecological impact and maintenance requirements.
When asked to rank plants from least desirable to most desirable, it's important to have specific criteria in mind, as 'desirability' can be subjective and vary depending on the context - are we assessing for their ecological value, ease of care, beauty, or something else entirely? Without an explicit table or context, I can provide a general idea of how plants might be ranked based on common factors such as the plant's hardiness, its ecological benefits, and its aesthetic appeal. Additionally, if given specific data about the plants, one could rank plants based on that data. For example, one could look at factors such as growth rate, size, flower production, drought resistance, and so on.
If you are looking at ecological value, native plants are often considered more desirable as they support local wildlife and maintain biodiversity. A ranking might place invasive species as least desirable (1), with critical-endangered native species as most desirable (7) because of their importance and rarity. For someone interested in low-maintenance gardening, the most desirable plants might be those that are drought-resistant, disease-resistant, and require less pruning - a ranking could be made based on these characteristics.