If everything has a purpose then evil doesn't exist

[R-Farmer]

that’s more of the kind of deeply ignorant and delusionally flippant bullshit that we can not but be expected to come from our  “farmer” here.  most seed plants seeds can’t survive prolonged immersion in water.  some land plant seeds germinate better if soaked for a few days.       but almost all will be killed if soaked for a few weeks and never germinate.   soak the seeds for a few month and almost all of them would have decomposed or disintegrated.

You are aware that 'most seeds' are not exposed to the environment, as they all come prepackaged in some sort of chaff or pod right? This utter shell or even fruit of the seed seal and protect the actual seed embryo. This protective layer is so strong it can in fact live through the digestive processes/acids in the gut of most animals.

That it normally take months of exposure to water and soil which through the decomposition of this outer shell and membrane allows the pod to errode away enough for the seed to germinate. That is One of the reasons why plants bloom in the spring after the rain. in the wild seeds are exposed many rain cycles or even constant direct contact moisture. for MOST of the Year. yet do not germinate till the spring. as the seed needs to sense a weather change, and moisture.

From britacanna online:

The seeds of many species do not germinate immediately after exposure to conditions generally favourable for plant growth but require a “breaking” of dormancy, which may be associated with change in the seed coats or with the state of the embryo itself. Commonly, the embryo has on innate dormancy and will develop after the seed coat is removed or sufficiently damaged to allow water to enter. Germination in such cases depends upon rotting or abrasion of the seed coat in the gut of an animal or in the soil. 

So the seeds (In most cases) are good indefinitely so longe as this putter 'seed coat'/shell remains intact.