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why do seeds that are already covered with dirt have to be germin

9 years ago

This is more one of those, "But...WHY?" types of questions. Why do certain seeds -that are already covered with dirt - have to be germinated in the dark?

I just bought 4,000 vinca / perriwinkle seeds and am traying them up. Finding a dark spot for all those trays is difficult when you don't have a cellar to use. So they are sitting under black sheeting in the garage.
I know it's not critical to know why, but is sure is one of those things that now that I've thought about it , will nag me.
THNX
mc

Comment (1)

fruitnut Z7 4500ft SW TX
9 years ago
Some light will penetrate into the soil. Distance of penetration will depend on the soil and conditions. If the seeds are very light sensitive it will help to have darkness to further reduce light at seed level.

You know how you can see light thru your hand in total darkness by shining a flashlight into your palm? Well the soil is to some degree like your hand, more light transmission than you'd think.
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