I am trying to plant palm trees from date pits. I've already done it. It's a very long process that takes about a year to show a recognisable palm. The date pit has to be first immerged in water for at least 15 days and up to 3 weeks. Then in wet cotton for the same time. Finally, we can plant it. The palm should be water only when the soil is fully dry.
I've been using cactus soil last time but they are sold in big quantity and I don't want so much of it. Which kind of soil could replace it, preferably sold in smaller quantity? Are there soil especially made for palm trees?
You can buy dried coco coir at any reptile hobby shops near you. Or order bricks online.
If it's going to be in the same pot for a long time, I would make an inorganic mix to prevent compaction and rotting of the materials (usually pine bark is the culprit).
Something like 50% horticultural sand, 25% aeration (pumice or perlite - perlite if it's a small pot, pumice if it's a big pot), 25% water holding (sphagnum, coir). Then you can either mix in a long lasting chem fertiliser, or use water-based frequently, or top dress with organics when required.
