You need to determine the difference between the two situations. Same mix? Same cultivar? Same watering regime? If all that is identical then once you've eliminated everything which has been the same for both containers you have to start exploring the differences. Perhaps it's the container? What's it made out of? Does it insulate the planting mix? Could the mix have got colder or hotter in the bag? Does the bag have the same amount of drainage? Does it contain more mix so it needs more water?

It's the same soil but different compost. The one on the right is self made compost and the left one is compost I bought in the gardening store

They get the same amount of water and the bag is a"smartpot" it's made for gardening

In the same bag I'm growing basil plants that are growing really good and has no problem

Thank you for the quick response !

What are you using for fertilizer? Compost doesn't contain all the necessary nutrients. I would try watering the little plant with fish fertilizer diluted according to the bottle. A liquid fertilizer will work more quickly but I think you also need to add some all purpose vegetable fertilizer.

I don't understand what you mean by same soil but different compost. Did you make up your own growing mix using different ingredients? If so there's your variable - the compost. I don't grow vegetables in containers and I'm not totally familiar with the nomenclature for growing mixes in the US but I think you should be using something called a 'potting mix'. I hope some US posters come along and shed light on the mix issue.

"It's the same soil but different compost."

Soil? In containers? Different compost is a big difference not to mention that compost does nothing for a container since there is no soil food web in one.. Plus both containers drain differently. And you don't mention any fertilizers.

Dave

I'm from Israel we have here growing mix containing mainly coconut

I never used fertilizers before and my veggie garden was always healthy and productive.. only compost

I guess I need to start using it now tho..

Hadas, can you define what you mean by the terms 'compost' and 'growing mix'?

The reason I ask is because different parts of the world use the terms interchangeably, and here in the U.S. they have specific meanings. In the UK for example, the word 'compost' refers to a variety of growing mixes. In the US, 'compost' is the term specifically used for the end product of decomposition. It is a soil amendment, not a growing mix.

Also in the US, and I suspect it's the same elsewhere, some growing mixes come with fertilizer already incorporated into the mix.

Oh, and if those photos approximate a true color difference, then if the varieties are the same, the uniform pale color of the top one suggests it can use a bit more nitrogen. That does not apply if they are different varieties. Differing varieties have different leaf and fruit colors.

The cause could be a number of factors. Are those heavy wood chips mixed throughout the soil medium, or just on top? Wood chips can make nitrogen temporarily unavailable to plants. The solution is simply to add a little more.

And bags tend to lose moisture much faster than an enclosed container.

rg raises a good point about terms having different meanings - specifically compost.

Here in the US what we call compost is, as he said, a soil amendment used to improve soil structure. It comes in all levels of quality but contains few nutrients for feeding plants and what it does contain is not available to the plants to use until it is pre-digested by the soil bacteria - what we call the "micro-herd". In containers soil bacteria cannot survive, much less thrive, so compost is of little use to us in containers. It doesn't hurt but also doesn't help. ;-)

Dave

If Hadas is using 'compost' in the UK sense it could be a potting compost rather than a rotting compost. In which case it would be useful to know what the two composts used contained.