Welcome to the list, Fernando! You asked when you should repot Lachenalia. The short answer is: when they are dormant. I think that's true for almost all bulbs. The major exception I'm aware of is the Amaryllids which have perennial roots even when they look dormant. Those seem to be happiest if repotted at the start of the leaf-growing season, when they can more easily replace roots that get damaged in repotting. As for other tips on Lachenalias... The bulbs are delicate and can get dried out, so don't leave them out of the pots for too long when you repot them (but they tolerate my summers in California, which are much drier than yours, so I think you won't have a major problem). Give them plenty of sun or they'll get tall and floppy. And they're relatively tender to frost, although I do not think that will be an issue in your climate north of Lisbon. If you're looking for insights on a particular Lachenalia species, look online to find the bulb's exact native location. A search on iSpot can help: http://ispotnature.org/communities/… Then you can use the PBS climate maps to compare your climate to the bulb's climate in South Africa. Here is the map for Europe: http://pacificbulbsociety.org/pbswiki/files/… Here's the map for South Africa: http://pacificbulbsociety.org/pbswiki/files/… te.gif Here's the overall article on how to read the maps: http://pacificbulbsociety.org/pbswiki/index.php/… Have fun! Mike San Jose, CA (zone 9, min temp 20F / -7C)
