Nutrient problem in bagged soil?

This year I am using Sta-Green Flower and Vegetable Planting Mix. I had really good luck with it last year ao I use dall new soil this year. Something is just not right this year. First, my second planting of my cucumbers is looking anemic. I lost the first batch to cold spring weather. The plants are starting to fade and yellow - again. Cannot blame it on the weather this time as it is quite acceptable now for cucumbers. Also, my basil has doubled in height but it is putting out really small leaves for some reason. The original leaves are quite large, however. My zukes are growing but slowlyband they too are pale.
Wha could be going on? They are exhibiting classic nutrient deficiency characteristic but this is new soil with extended release nitrogen.
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Paul M. Cook wrote:

could have been a bad batch.
dunno for sure.
have you taken a planter apart and observed the condition of the soil/roots?
we had a period of dry weather and a lot of mixes don't do well if they get dried out (they form pockets of dry soil that are very hard to get wet again). or it is possible in your planters that the soil has shrunk away from the edges and your watering gadgets are putting the water on but it is running down the sides and out the bottom and not actually getting in there.
songbird
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As it turns out I did do that. Soil was lightly moist all the way to the bottom of the pots. This morning myt cucurbits were all displaying heavy leaf miner damage on the cotyledons. Up until today it was only a few. All of them have stunted second leaves which dried up and died. The new leaf buds all looked brown too. Could the leaf miners have done this? I am guessing they got into the stem of the plant and injured it from the inside? Or is it just the leaves they infect?
I am having the worst luck with miners this year. All my cucurbits are looking like they are dying. And this was the second planting.
Paul
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