@Elisha, they just changed this yesterday so now you can get them from 2 chop trees as well as from pines on neighbor's homesteads!

I dont think its fair that the 'fine pine' items only come from large or extra large pine trees only on our homesteads... It takes FOREVER for pine trees to grow... I read ahead and planted them 4 days ago and they are still very small... Is there anyway it can be changed for neighbor's pine trees too????

I finally had to contact support last night. After 100 rocks or so you would have thought I would have gotten sand. Then the same thing on my homestead with the pine. Funny though, after support gave me what I needed they both started to show up like crazy! It's almost like they relased them missions before the items were set to drop.  

visited neighbor's for rocks to get sand and got nothing until today...got 2 sand so its starting to show up...tried to get more because you need 4 but no luck...wonder if they only allow so many per day and only after visiting 18,000 neighbors......

Every time I visit it refresh's.Getting really tired of this game and glitch's.

I have visited about 15 and not a single Pure Grain 

I went to about 8 of my neighbors farms to clear rocks and got 4 pure grain...not a glitch

they would be the 7 and 8 chop pine trees you have on your place.  I went to neighbors and cleared rocks for the pure grain sand and didn't even get one drop, wonder if that is a glitch, it says your or your neighbors place.

where do you get L pine trees or XL pine trees ?

ty for sharing this information :)