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The Flint County weedfield is far by the most popular field for growing Weed in, many people are seen coming and going (some in handcuffs) it's also a place where cops like to camp and make sure no one is using it to grow weed.
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There is another weedfield in Flint County it sits upon Flint Range it's housed on a Large Farm the weed plant itself grows inside a greenhouse. Popular with Police who usually fly past in Helicopters scoping out the place for weed growers.
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This field is located in Red County on some kind of abandoned Farmland, it neighbours Palomino creek and is a hotspot for Criminals who are in the drug business.
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Located in the desert of Bone County near the Hunter Quarry the place is great for growing Weed you will hardly get a visit from the cops while being here as most of them are to lazy to come as they eat donuts in LS.
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A new field that has been added and is weirdly placed at the Rockstars Hotel not known to many therefor making it easy to grow large amounts of Weed.
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You can order heroin here in Bayside at the dumpster located in the Caravan park.
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This Ship docked near the SF Naval Base you can order heroin down inside the cargo hold.
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Heroin spot located near the LV DD Stadium you can hop inside the open box and order some heroin.
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Located in East LS-Jefferson you can order heroin inside the small alleyway.
Not finished updating will add rest of the fields when I can, but since there's practically no reference as to where they are here are 5 of them there's still another 3 I have to add but if you want get the other 3 and PM me the pictures. Make sure the chat and HUD is hidden and that you do the /deal animation next to it.