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I've read the answers to two similar questions but as the answers were opposing, i couldn't be sure what action to take. Here is what I have:

Here (Figure 1) is my Avocado plant, which i had potted with no leaves (it had rooted in water), 1.5 month ago.

Figure 1: Avocado plant.

Brown spots started to occur on the oldest leaves and now they are spreading through the younger ones. Here are some photos of the brown leaves.

Figure 2: Brown leaf. Figure 3: Brown spot detail.

Now I will give information about the other conditions of the plant.

The soil I use seems me a little strange but the seller had told me that she also planted an avocado with this soil. It looks a little reddish, and it is a light media. You can see the soil below.

Figure 4: Soil media.

It has some white, salt like things in it, probably the minerals.

Figure 5: Minerals in the soil.

Here is the information on the soil package.

Figure 6: Soil information.

It is in a clay pot (but dyed), with a single hole at the bottom. I had also put some stones at the bottom for drainage.

Figure 7: Pot. [![Figure 8: Pot hole.][8]][8]

I water the plant rarely, when the soil dries like 3-5 cm, or, when the leaves bends slightly.

It stands near a north-east facing window.

I couldn't decide if the cause is too much fertilized or poor fertilized soil.

Waiting for your suggestions, thank you :)

Edit: 15.03.2019,

It's getting worse. Vermicompost and changing to a normal soil didn't work. I had also taken the plant to the south-east window for more sunlight.

[8]: https://i.stack.imgur.com/sL6lq.jpgenter image description hereenter image description hereenter image description here

  • Is the soil you used actually potting soil, in other words, meant to be used for plants growing in pots? – Bamboo Feb 7 '19 at 18:58
  • Yes i guess, It says "for seeds, garden plants, pot plants (this what you mean i think), vegetable gardens, greenhouses and tree seedling as base". – Dila Feb 8 '19 at 7:07
  • Not sure what this is - doesn't seem to be fungal in origin. Is there anything under the leaves, especially on the other side of the visible brown spots? The soil in the pot looks dry - how much water do you give it when you do water? – Bamboo Feb 8 '19 at 12:56
  • The photo shows under the leaves actually. Brown stains seem lighter at the top. Like they are occuring at the back but also visible from the top. – Dila Feb 9 '19 at 5:37
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    The stones in the bottom of the pot are not necessary and can actually cause what's known as a perched water table. Apart from the soil appearing too dry, I don't really know what those spots are - if the soil was too wet, it might have been anthracnose. Possibly a build up of salts in the soil, maybe... – Bamboo Feb 10 '19 at 12:49
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Not sure what the brown spots are on the leaves. That isn't soil though - looks like coco coir. If the avocado seed is only in coco coir, then the roots are struggling to find nutrients, as coco coir isn't used for nutrients.

If it were me, I'd replace it with some proper organic seed raising mix - get one that's soft and fluffy to the touch. If it's chunky or dry/crumbly in any way, don't use it. Then add maybe a teaspoon of vermiculite on top (spread evenly - this helps to retain moisture). Then give it a good water - when water starts coming out the bottom of the pot, that's when you should stop watering, and add some woodchips/mulch on top of the soil as a cover (don't use any dyed mulch though, and don't use mulch that's been treated with chemicals, and especially don't use mulch that's come from a diseased tree). The cover of mulch acts as a blanket to keep the soil moist, and protected from the harsh sun. Notice in nature how it's always covering the soil? If there's no twigs, branches, leaves, etc. - then nature will use grass or weeds to cover the soil. We as human beings are so stupid that we think we're doing plants and trees a good thing by exposing the soil and letting it dry up. Good woodchips or mulch as a covering helps tremendously - and each time it's watered, it will basically release some of the nutrients in the woodchips/mulch into the soil. That's why forests do so well - they don't need any fertiliser from any companies, they just use twigs, branches, woodchips/mulch basically.

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