Avocado leaf browning, what is wrong?

I have placed my avocado seedlings on my window sill in my previous house. They were growing quite well and I didn't notice any abnormalities. However, I had to move house and I took them down from the window sill and notice that there are leaves turning brown. I'm not sure whether it is caused by salt accumulation or too much water.

As the new house has a big balcony which has at least 7 hours of direct sunlight, I'm afraid that it will burn the leaves. I bought new pots (bigger) and a couple of kilograms of garden soil. I just removed the seedling from the old pot together with the soil and placed it into the new bigger pot. I added the new garden soil around the perimeter to top-up the soil to the empty area.

I chose garden soil as I thought that it will be better than the commercialised potting soil. I will monitor closely and changed the soil if the plants are in stress.

I have three seedlings that have grown quite a bit and I placed one seedling in full direct sunlight and the remaining two in partial sunlight. Below are two photos that showed the leaves turning brown partially and not at the tip of the leaf. I was thinking of sun-burning of the leaves due to the intense sunlight but I'm not sure. Anyone has experience in this kind of problem? Please share and advise.

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Leaf turning brown - what is the cause?



Leaf turning brown - what is the cause?

Air Layering of Hibiscus Plant

On new year's eve, I tried to propagate my Yellow Hibiscus Plant. This Yellow Hibiscus is pretty and had bloomed 5 flowers already. It is still producing buds for flowering. I tried to pollinate the flowers but failed. The "ovaries" would drop from the stalks after a couple of days. It is very difficult to pollinate the flowers.

I made two cuts on a woody branch that has no bud. I peeled the bark away between the two cuts to expose the white area. Under the bark, the branch is green and you need to cut or scrape the green surface away. Try not to do too much as it may break the branch. I cut a hole in a plastic bag and inserted the branch into the hole.

I tied the end of the plastic bag with a wire to secure the base with the branch. This is to prevent the sphagnum moss from coming out of the bag.

I used a swap to apply the rooting hormone onto the white surface of the branch.

Applying the rooting hormone on the exposed branch area.

I have pre-soaked the sphagnum moss in water for a few hours. Squeezed dry the sphagnum moss but they are still moist. Wrapped the moist sphagnum moss over the branch and covered it with the plastic bag.