The sentence "Rarely does a plant grow that we can eat" is expressing the idea that it is uncommon for a plant to be grown that is edible for human consumption.

Introduction:
There are numerous plants that grow around us, but not all of them are edible. In fact, there are several plants that are either toxic or inedible for various reasons. In this response, we will explore the reasons why some plants are rarely edible and the factors that determine their edibility.

Reasons why some plants are rarely edible:
There are several reasons why some plants are rarely edible. Let's discuss a few of them:

Toxicity:
- Some plants contain toxins or harmful substances that can be dangerous if ingested. These toxins can cause illness or even death in humans and animals.
- Examples of toxic plants include poison ivy, oleander, and deadly nightshade. These plants have evolved to produce toxins as a defense mechanism against herbivores.

Physical characteristics:
- Some plants have physical characteristics that make them inedible. For example, thorns, spines, or prickles can make a plant difficult to handle or consume.
- Other plants may have tough or fibrous leaves, stems, or roots that are not palatable or digestible for humans.

Cultural factors:
- Edibility can also be influenced by cultural factors. Some plants may not be commonly consumed due to cultural practices or beliefs.
- For instance, certain plants may be considered taboo or forbidden in certain cultures or religions.

Environmental factors:
- The environment in which a plant grows can also impact its edibility. Some plants may only grow in specific habitats or regions, making them inaccessible for consumption in other areas.
- Additionally, soil contamination or pollution can render plants inedible due to the accumulation of harmful substances.

Conclusion:
While there are many plants that we can eat, it is important to remember that not all plants are edible. Toxicity, physical characteristics, cultural factors, and environmental conditions can all contribute to the edibility of a plant. It is essential to have knowledge and understanding of plants before consuming them to ensure our safety and well-being.

Properly