So, I harvested 90 lemons and foraged the tiles as well - got 16 branches, no iron rocks and no seedlings - thank goodness - seedlings need to have discard option, like branches and rocks and logs.
Then I harvested another 65 lemons and foraged the tiles and got a further 14 branches, 1 iron rock and 1 seedling.
Is something broken here? If not, could some balance be introduced maybe ?