I'm planning to plant some leafy greens for a tortoise I'm going to get soon. I want the basic directions for planting and caring for the greens provided I have attained the seeds. The greens I'm planning to plant include endive, mustard greens, bok choy, and kale. I am a complete beginner to planting so if planting some of these is rather challenging then please notify me. I'd also like to know if some would only grow at a specific time of the year. Our weather here is Mediterranean.
I'm planning on separating the greens from each other. My basic idea for the enclosure would be a large container into which I put smaller containers I fill with sand and plant in, all of the same height. I'd like to know what kind of soil is preferably used (it seems to be that calcium rich soil discourages the excess presence of oxalic acid, oxalic acid can bind up calcium, adversely affecting the tortoise's shell strength.) I also want to know how much soil I should have, and if possible, a rule of thumb to how many seeds per quantity of soil (size of container). I'm also wondering how often I should water it (Perhaps in relevance to temperature conditions), provided the plants will get sun exposure. I also want to know the time they're expected to take to grow.