Pam,
This has been a problem ever since the supernatural patch. The gardening page in the journal remained blank and the sim was unable to harvest in the WA locations. After a lot of trying different things I found that if the sim collected nothing prior to travelling, then the journal would be initialised in the destination town and if the first item collected was a harvestable, the plants page would be available in that location and your home town only. From other questions on this forum, I know many players had this problem and obviously told them how to partially solve it. I believe it was fixed for those who bought supernatural when they installed the EP. But, it remained for anyone without SN. I was pleased to find it is finally fixed, though I don't know if it was the 1.50 patch, or if the superpatch fixed it. It might be useful to know which, as, if it was the superpatch this may be a way around any possible similar situations which may happen with new patches.