this should be in the perennial forum.. rather than the propagation forum ...

there is a wider audience of peeps there ...

otherwise.. post where you wish ..

that said.. you water when they need water.. not by some schedule.. insert finger.. and do not water again.. until the soil dries.. or gets hot [it will be dry tomorrow] ...

and NEVER fertilize a stressed plant.. and a transplant.. is stressed by definition.. perhaps you burned the disturbed roots ..

and yes.. having divergent plants in on pot.. can cause watering issues ...

you said: Im beginning to think they thrive on neglect.

===>>> yes.. that is another way of saying.. you might be killing them with too much love ...

ken

I wonder if you loosened up the roots when you took them out of the pots? I think if you dig one up, you might find they have never grown out of the compact root as it was in the pot. Lavender transplants well and is almost a native in your Mediterranean climate. Al

Thank you both for your answers.

Water every other day in Monterrey? Too much water.