Crystal acorns are seeds used in the Farming skill. At level 74 Farming, crystal acorns may be planted in plant pots with a gardening trowel and watered to become crystal saplings. They can be obtained as a reward from the Elven Crystal Chest, by catching crystal implings or from trading crystal weapon, armour, and tool seeds to Pennant in Prifddinas. Pennant exchanges one acorn in return for any one seed.
After planting the sapling in a crystal tree patch found in Prifddinas and waiting for it to fully grow, which takes about eight hours, the plant will grow into a crystal tree which can be cut to yield crystal shards. Planting the crystal sapling yields 126 experience, and checking its health gives 13,240 experience.
Harvesting crystal trees grants 8-16 crystal shards, depending on the type of compost used. Ultracompost is the best for this. Magic secateurs have no effect. Players can also receive bird nests after chopping the tree down.
For an exhaustive list of all known sources for this item, see here
- ^ Jagex. Mod Ash's Twitter account. 6 August 2019. (Archived from the original on 28 May 2020.) Mod Ash: "[Does using magic secateurs increase the amount of crystal shards from harvesting crystal tree?] No, the secateurs don't help with that. Compost does."