If you're looking for the highest chance of finding lemons and apricots in ARC Raiders Items, you'll want to head to The Blue Gate map and search around Olive Grove, which is located on the southern side of the map, just below the Checkpoint. Usually, there are a fair number of trees spread out amongst this area, and most of the time, you'll find either lemons or apricots, and sometimes even both. However, you'll also find a solid number of olives, hence the name of the location.
While Olive Grove isn't an inherently dangerous location on The Blue Gate map, you'll want to keep a vigilant eye out for enemy players who are also searching for lemons and apricots. The Olive Grove has become a hotspot for this very reason, and players who aren't even looking for the fruits will camp out here waiting for players to come along who are trying to upgrade Scrappy.
For any players who don't want to rely on the tree method for acquiring lemons and apricots in Arc Raiders, there is a secondary way to add the fruits to your inventory. This is by searching baskets on maps, which can be found in most buildings and houses you come across. The Buried City is the best map to find baskets, as they are located in several locations, most notably the Grandioso Apartments and the Santa Maria Houses.
Finally, to boost your chances of finding lemons and apricots on any map in buy ARCR Items, you'll want to keep an eye out for the Lush Blooms event. This event can be hosted at any time, and it provides a flat buff to the number of fruits and other vegetation that spawn on a map. The map the event is hosted on seems to be random, so if you happen to see the event occurring on a map you have unlocked, it's best to hop in and see what you can find.