When to cut back my Satsuma?

You can prune citrus selectively anytime for dead, crossing or wayward branches; but heavy pruning, removing 25% or more of the canopy I’d say late winter - late Jan/Feb, before new growth emerges.

You don't want to prune now since those branches will have this years fruit coming in during the fall.

Like others have said, Jan.-Feb.

Well I spoke too soon. Noticed yesterday that half of the fruits are splitting.

Is this a drought thing?

quote:

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Noticed yesterday that half of the fruits are splitting.

Is this a drought thing?

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A quick google search says a potassium or calcium deficiency can cause splitting.

Also, drought conditions cause the fruit to shrink and if watered too much, it can quickly swell the fruit and cause the rind to split.

Also, too much rain can cause that. I've had rain cause splitting my tomatoes and figs one year, so much so I lost most of them once they split and bugs took over.