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Old 10-15-2017, 09:26 AM   #2 (permalink)
aruzinsky
 
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Default Re: Bananas grow smaller each year...

Quote:
Originally Posted by nph View Post

However something is missing since my Sweetheart and Nam Wah grow shorter each year even though they had a long growing season.
Any idea of what I should do/add or soil to use? I have them around my pool and even though I replace some soil they don't grow as high as they used to.
Since some of your soil is old, you should be aware that it has been empirically proven that it is best to rotate crops because crop productivity declines for a particular crop in the same soil. The exact reasons for this are theoretical. See https://en.wikipedia.org/wiki/Crop_rotation .

The "nutrient deficiency" theory is not the only theory. In my experience with tomato plants, there is nothing you can add to soil to replenish the productivity of virgin soil. And, this explains "beginners luck" in gardening.

I suggest that you grow something else in the same spot each year.
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