I haz a puzzle.
Take a good look at the above picture. Four pots of lithops seedlings, two pots with much larger and healthier-looking seedlings than the others. The pots on the left contain 4 types of 'thops, all sown on May 27th, 2011. Top to bottom they are: L. aucampiae ssp. euniceae v. fluminalis (C54), L. lesliei 'Storm's Albinigold' (C36B), L. salicola 'Malachite' (C351A) and L. dorotheae (C124). The pots on the right contain two types of 'thops, all sown on April 3rd, 2011. Top is L. optica 'maculate' and bottom is: L. schwantesii.
Yup, that's right, the seedlings on the left are almost two months younger than the ones on the right. My mesemb mentor planted some opticas and schwantesiis at the same time I did, and his are much bigger and happier looking.
So what did I do wrong with the first batch? (my first lithop seedlings ever I might add). I've tried feeding them some dilute fertilizer to no avail. My soil makeup hasn't changed much - mostly I just added some Schultz Aquatic Plant Soil to later batches to keep the soil nice and loose and well-drained.
Should I try and pull the stunted ones out and repot them? Some are only 3mm across, I'm afraid I'll kill them; but then they obviously aren't happy where they are. Should I use more fertilizer?
Only one, this little L. schwantesii has even tried to change it's leaves:
Poor thing, it's only 6mm across.