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1 has some similarities to matudae - https://www.paraisodassuculentas.com.br ... a-matudae/

It's a (monstrose/crested) form of Opuntia microdasys (Bunny ears).

Or M. compressa ?

Looks like Mammillaria longimamma

Cereus forbesii ?

The Mamm look very elegant - so maybe elegans ? (Might also be pseudoperbella)

There is also Pilosocereus glaucochrous - don't really know the exact difference

Third looks like a Parodia magnifica variegata

Is this the spiny Euphorbia ? https://www.giromagi.com/en/shop/euphor ... onii/44214

A cat in a box. Nothing more entertaining to watch and nothing more satisfyingly for the cat.

It seems so (according to the net)

https://www.pinterest.se/mimimememe/cat ... seriously/

The 2 LED-lights in the depicted setup are 2x50 W so there is (more than) enough heat

Aloe humilis (or a close relative) , Sansevieria francisii

I only sow indoors under artificial (LED)lights

Or you can buy seeds and sow. Google for 'hildewintera colademononis seeds'