Different parts of the world yield very different results... I live within a few kilometers of the 50th parallel, north latitude.
Summer daylengths, June 21st, are almost exactly 16 hours. Winters.... well, December 21st offers 8 hours.
Summers on the east coast of Vancouver Island (Canada) feature a 'rain shadow' -- almost no clouds for months at a time. Winters are almost entirely under a very heavy cloud cover.
In addition, most house windows are shaded by conifers in my neighborhood. (The leaves don't drop).
I did the math, referring to a few websites for accuracy... it's staggering. The plant on my winter windowsill receives less than 10% of the light that a summertime plant in someone's garden receives.
In my area, artificial light is the only way to maintain an actively growing plant. I speak from experience as well as research. The only other answer is dormancy.
Other areas, as i say, are different.
Summer daylengths, June 21st, are almost exactly 16 hours. Winters.... well, December 21st offers 8 hours.
Summers on the east coast of Vancouver Island (Canada) feature a 'rain shadow' -- almost no clouds for months at a time. Winters are almost entirely under a very heavy cloud cover.
In addition, most house windows are shaded by conifers in my neighborhood. (The leaves don't drop).
I did the math, referring to a few websites for accuracy... it's staggering. The plant on my winter windowsill receives less than 10% of the light that a summertime plant in someone's garden receives.
In my area, artificial light is the only way to maintain an actively growing plant. I speak from experience as well as research. The only other answer is dormancy.
Other areas, as i say, are different.