Light and soil warmth, but primarily light.

"Adam Schwartz" wrote in message
news:hHSoa.552406$3D1.304017@sccrnsc01...
Is it increased water, warmer temperatures, more daylight or something
else?
I ask because my lemon balm, sage, lavendar, thyme and oregano all still
look like they did in January.

Thanks,
Adam (zone 5, Iowa City)