Heirloom? Organic? Hybrid?

So what are heirloom seeds? And are they different from organic seeds? And what do they mean when they refer to open pollination? And what about hybrid seeds?
Heirloom seeds are, as the name implies, seeds that have been handed down, which have been saved from plants that have been grown by a number of generations in one area. The seeds are taken from plants or vegetables that were commonly grown during earlier periods in human history, but which are not used in modern large-scale agriculture. They have been saved because of their flavour or texture or colour.
Typically, heirlooms have adapted over time to whatever climate and soil they have grown in. Due to their genetics, they are often resistant to local pests, diseases and extremes of weather.
Organic seeds are seeds that have not been treated with any chemicals, which are added to increase shelf life or improve germination rates or to withstand diseases, and they have been harvested from plants which have been grown without the use of any chemical pesticides, herbicides, fertilisers or any other chemical treatments.
Not all organic seeds are heirloom seeds and sometimes heirloom seeds are not organic.
All heirloom seeds are open pollinated, which means that the plants are left to natural means of pollination, such as bees, birds, wind or some other natural vehicle. The plants can then be grown in isolation, so that they are self-pollinated or pollinated by plants of the same variety, which means that the new plants will be exactly the same as the “parent” plants. This is called “breeding true”.
Hybrid seeds have been developed through selective breeding. Certain traits have been identified as desirable and have been cross bred with plants with other traits, resulting in plants or vegetables of a uniform size or shape or texture or colour or they might be drought or disease resistant. (This is not the same as genetically modified plants, which have been genetically altered using molecular genetics techniques.)

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