Have you ever had your water source analized, or if you use a public source have you ask for an analysis? Sounds like high bicarbonate, or carbonates. -Silixa

Bill, next to checking your water source, how often do you feed your plants in pots?
They are heavy feeders and unless you are consistently feeding them they will struggle to grow as mine use too.

Mike

Thanks for the replies.

I water them from a rain barrel. I haven't tested the water, but it's the same barrel I use for all my other container plants without problems. Would citrus be much more sensitive to water than other plants?

I use a regular strength dose of a Miracle Grow type fertilizer every 2 to 3 weeks.

Bill

Does it provide Calcium and Mg?

I would feed more regularly at a weaker dose. You must use fertilizer much more often than every 2 to 3 weeks if you are using Al's mixes since every time you water, especially with rainwater. You dilute any available feed to almost nothing.
Rain water is perfect for citrus! I wish I could use it all year long.

Good luck Bill!

Mike:-)

I'm thinking along the lines of Mike, here.
I, too, use the bark-based mixes, and they must be fertigated consistently.
If your fertilizer isn't providing all the essentials, you'll need to supplement.

I'd opt for lighter doses applied more frequently.

Josh

Thanks again. I will try weaker doses more frequently, use a supplement, and see if they perk up.

Bill

Meyermike brings up a good point for anyone that irrigates their citrus with rain water, or even snow water for that matter. Both sources are a pure water source, that do not contain nutrients. If you use these sources of water you need to add about 10 percent of tap water, or some source of calcium and magnesium.Packaged fertilizers do not normally supply these nutrients. Without the addition the tree will soon begin to show a deficiency. - Silica

And Miracle Gro certainly does not provide the nutrients Ca and Mg in the way that Silica good points out you citrus need.

Can you use a fertilizer with Ca and Mg such as Foliage Pro or can you compensate by using epsom salts and gypsum?

Welcome back Silica. Hope you have been well.

Mike