The carefully controlled conditions which you stated obviously describe your serous determination to achieve your germination goals. If you don't mind my purely anecdotal suggestions, maybe they could boost your results in any future attempts. I've been growing cacti from seed for many years. My fir...

This looks like your Mammillaria III

Perhaps M. klissingiana

Or possibly a close relation of Mammillaria tlalocii = Mammillaria huitzilopotchlii since the central spines are usually produced on older plants, often intermittently or not at all. huitzilopotchli.jpg huitzilopotchli2.jpg Agreed. Another possibility is the enigmatic M. sp. FO 229 : https://cactus...

This is how I start dudleyas from seed, tray of peat based seed starting mix, tapped on the ripe seed pods over the tray (around sept). Water and cover with a dome and leave in moderate light in the greenhouse all winter, keeping it moist. Typical night lows in the 30's and 40's. Dudleya grow on mo...

jerrytheplater wrote: ↑Fri Mar 29, 2024 2:52 pm It sounds like you are thinking of making layers in your pot. That is not correct. You need to mix your potting mix thoroughly.

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I remember reading once an assertion by the owner of Miles to Go (Miles Anderson) that it usually takes around 6 years for most Ariocarpus to reach flowering size from seed on their own roots. The biggest obstacle now seems to be acquiring accurately labeled seed. Before Mesa Garden changed ownershi...

It could be, but may also be the closely related E. adustus

My guesses: The cluster on the left looks like a Euphorbia . Either E. tubiglans , or a hybrid with E. polygona . On the right the stems appear to be withered Echinocereus viereckii var. morricalii . Steve's suggestions for pot size are very valuable. Be sure to wait at least a week after transplant...

Great looking images. The succulent might be a Dudleya saxosa.

Based on my limited experience with growing a few milky types of this genus, my first impression was that it could be a M. magnimamma. The guess of it being a M. sartorii seems possible, though less likely.

Looks like a popular cold hardy succulent known as Orostachys boehmeri

1 & 4 look right. I'm sorry I can't ID the rest.

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