Citrus > Citrus General Discussion

So citrus trees are *not* generally ideally full-sun plants?

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I suspect the increase or decrease of crop potential, is more of a University thing, then a commercial growing situation.

My 1 cent experience:  in Cebu island Philippine 9.9 N from the equator: lemons and mandarins perform MUCH better in partial shade/filtered sunlight than in full sun.
I didn't notice any difference for pomelos since all my trees are in open soil / full sun.
I'm from Italy and at my latitude all citruses are typical FULL SUN/south  exposure trees.
But there it is 45N way different from here were equatorial sun can be really scorching!

Indeed, ~2200 umol/m/s is cloudless sun directly overhead. Your typical blazing tropical dry season sun, your typical desert summer sun. Any clouds, even wispy ones, and any angles, reduce this. 

That said, if these studies (there's not just one, multiple come up with the same number) are correct, then it's not just an issue that citrus gets stressed by full sun - it's an issue that citrus can't use the extra energy at all, regardless of how much stress there is on the plant.  The sun can only add stress.

Old thread, but not sure where else to put this question --

am I better off giving morning or afternoon sun, if it's either/or?

Interesting thread. I am in a Citrus and grapevine growing area with hot summers.
The established Citrus groves are much more shady than the rows of grapevines.
Citrus trees would be self shading when older, and parts or sides of the tree would be more or less heavily shaded as the sun moves over the day.
A few people have put full shade covers over Citrus groves, probably 20% shade weave also for hail protection and wind protection.

Overall, I would say morning sun, afternoon shade, more so in hotter climates.


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