maybe do a new natural resource and call it NaturalResourceAppleWild.rsc or NaturalResourceApple.rsc (instead of appletree)
open the onion one and copy paste it into it.
in the paragraph NaturalResourceDescription naturalresource replace the onion by "Template\RawMaterialApple.rsc"; which will give you the same apple that the orchard produce.
and since in the rawmaterialApple the number is 2x higher thatn Onion ... cut the spawn chance by 2 ? (0.2 instead of 0.4?)
you will be able to play with the numbers without affecting the orchard apples.
same with your flax, do another natural resource with another name and lead it to your flax and play with the spawns/Noise/Neighbors numbers
