Here's why:
* High temperatures damage cells: Hot water can damage the delicate cells within the seed, making it impossible for the embryo to develop and sprout.
* Enzymes denature: Heat can denature enzymes within the seed that are crucial for germination processes.
* Seed coat damage: Hot water can soften or even damage the seed coat, which can prevent the seed from absorbing water and oxygen properly.
Instead of hot water, use lukewarm or room temperature water for seed germination.
However, there are some exceptions:
* Scarification: Some seeds with hard seed coats benefit from a brief hot water treatment (around 180°F) called scarification. This helps soften the seed coat and promote germination. But this is a specific technique and needs to be done correctly to avoid harming the seed.
* Certain species: Some plant species, like some cacti, benefit from warm water treatment, but this is usually not boiling water.
In general, it's best to avoid using hot water for seed germination and stick to lukewarm or room temperature water.
