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Member - it's a euphemism
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I am new to this, but I have started small. On my deck, I have a couple of pots, one with cherry tomatoes, and another with mexi-bell peppers, and mild jalapenos. The pots are bigger than what I have seen others doing. They are about 14" high, and 14-16" wide. The soil is a mixture of top soil and miracle grow vegetable garden soil, about 50/50.
The tomatoes started out great. Decent sized for being cherries. They are now getting smaller. Smaller than a typical child's marble.
The peppers are all small. The bells are supposed to be 4.5x4", but they are between 1.5 and 2" is all. They are now red, and ready to eat. The jalapenos are maybe 1" long is all.
Where the pots sit, they get plenty of sun. Just not sure what each of these situations mean.
At the moment, I only have this option of growing. No yard space for a garden yet. Plus, for now I am just looking to learn a few things.
 

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Hobby = Snail Porn
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Could be a lack of water. Pots drying out too much during these horrible heat waves.

Could be they are running out of fertilizer. That's why the crop is getting smaller and smaller.
 

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You Cant Eat ......
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Could be the heat off the deck drying things out. I had this problem when i tried to grow a cherry tomato hanging basket. Although the basket did not stand directly on the deck, the heat off the deck was frying the tomato, no matter how much i watered it.

I actually hung the basket on pole in the yard and it immediately perked up and increased the yields
 

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Great White Hunter
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I'll second both of those. They either aren't getting enough water or there aren't enough nutrients in the soil for larger fruit. This could be because of two reasons: 1: the plant may be trying to produce more fruit than it has nutrients for, in which case you could pinch off a few of the flowers reducing the amount of fruit the plant needs to provide nutrients for. 2: There simply aren't enough nutrients in the soil.

EITHER WAY: Adding some Miracle Grow for Vegetables to your soil may help. I see you cut the MG soil into your regular soil, when I pot veges I usually don't cut it and they turn out fine.

I see you're in Iowa. Before this nice cooler air hit, the sweltering temps we had in this area probably did a number on the moisture in your plants. When the temps are 80 or above, and especially when it's breezy, water in the morning and in the evening. (Assuming you have decent drainage in your pots)

That should be all you need!
 

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Tell the truth, coward.
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You used that miracle grow - I don't see it being a fertiliser problem. - the usual reason for small fruit upon maturation in my personal experience is either the soil getting too hot in a potplant, or the roots are really stunted in a pot too small and your pots don't sound too small.

I'm going with heat. Be careful about watering potplants that you don't get dry spots especially in prolonged hot weather that do not happily absorb water afterwards. They can have all the water just slide down the outside and not absorb into the soil.

If there were anything I would suggest it would be to loosen the soil on top, and then mulch them with anything you can, even pebbles works - just 3 inches of something between the soil and the heat. Obviously too late for this lot, but for the future mulching will be vital and maybe finding a way to shade the pot itself from the sun.
 

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I agree with too much drying out and not enough nutrients. Also, for items that bush out a lot like the peppers and tomatoes, try 5 gallon buckets, they're cheap at any hardware store and walmart. They give a bit more growing room for tomatoes which have roots that can go up to 12" deep. The deeper pots will give everyone a bit more room to stretch their legs.
 
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