I would change your potting mix to a commercially available mix, if available.

I want my potting mix to be able to support my plants without mixing special fertilizer blends.

Where are you?

Your soil mix sounds very unfriendly, potentially excessively water retentive but also potentially hydrophobic if allowed to dry out and too quick to breakdown. And I am confused by your numbers.....250%?? Also dry organic fertilizers are pretty useless in a container situation.

And when you water, you want to water fully. Don't measure it (500 ml is nothing - you are just teasing with that small an amount!) but water until the media is fully hydrated and water runs freely from the drainage holes

im from mexico, i have used soil that i got from home depot before, and my 2 climbing roses died in about 2 weeks in it, i have tried other blends, like coarse sand instead of perlite, and other kinds of materials for soil, and the other plants (they wasnt roses) died too, this time they had lasted way longer (i had one for a year before it died). but im gonna change the soil again and see what happens

when i water 500ml the water comes out from the bottom, all pots are the same, numbers refers to parts, meaning 1 part perlite, 1 part peat moss, and 1/2 parts humus. i was confused too when i was told to use those % for the soil of the roses

I understood your numbers. I would not use that mix. Probably hydrophobic.

do you have access to commercial container potting mix?

haha i was editing my previous comment when i got your new answer.

i have used soil that i got from home depot before, and my 2 climbing roses died in about 2 weeks in it, i have tried other blends, like coarse sand instead of perlite, and other kinds of materials for soil, and the other plants (they werent roses) died too, this time they had lasted way longer (i had one for a year before it died). but im gonna change the soil again and see what happens

When you lift the pot is it heavy like it‘d be if the soil was thoroughly soaked? Sometimes if your soil is too dry, water will run right through it. If it feels light, put something that will catch water beneath the pot, water until there is about 1” of water in the ‘water catcher’, let it soak overnight. A full pot should feel heavy.

yeah i can feel its way more heavier once i have water them

Hard to tell how big your containers are but when I water my 7 gallon pot I usually use up 1 gallon of water, which is over 3000ml. I wait for a bit after first round of watering then go for a second round. A little water comes out from the bottom but not too much.

Good luck with your roses!

they are about 10L containers. thank you, i really want them to be fine

I don't know what is in your organic fertilzer, but some of your leaves with the brown dry edges look exactly like mine when I've over-fertilized. It took a long time to get back to normal. Now I just use a liquid fertilizer very dilute.

i see now what was deleted..

last pic.. arent those new viable buds ... focus on new growth right now... if those continue.. there may be no current problem .. other than maybe too much fert.. too fast.. and too much water.. let them near dry between waterings ...

move to bright shade to reduce stress

ken

Hi, “way more heavier” with 500 ml of water, in a 10l container doesn’t pencil out.

OK I figured it out. the OPs mix is often used for marijuana.

Roses have different requirements. Please buy a commercial potting mix.

To put into a US perspective, 500 ml is roughly 2 cups of water. Not anywhere sufficient to water a 10L (2.5 gallon) container and could not possibly make the container "way more heavier" !!

mmm well thats how i feel it, for me it was quite heavier than before, to put it in how i feel it, before water it i can lift them with one hand easily, after water them i need 2 hands or the pot tilts a lot to one side from the weight, i must add that recently one of the roses got root rot after it bloom and died (the first one to die, and the one i had for 1 year with this 500ml watering) i read that happends from too much water, soon after the other ones started to have problems too, thats why im lost and decided to ask for help, i dont know whats happening, too much water or too little i dont know anymore

Stop the fertilizer for now and water until water runs through and pot really absorbs the water daily in Mexico in Summer. Using saucers under pots in a very hot climate, might allow the peat moss to rehydrate. Some sink a dried out pot in a trug of water to rewet it after the soils got too dry and hydrophobic. This would be for an hour or so, not consistently. Some use half or quarter strength liquid fertilization on pots. This could be done later every week or two after the roses recover. Good luck.