Guide: When To Plant Outdoors & Force Flowering Without Covers For Multiple Harvests
Ive been looking for information on force flowering plants without having to cover and uncover them everyday.
I found an article that explains how to do just that and harvest multiple times during the outdoor season in the northern hemisphere pretty well, I wrote my own notes and figured this could help people feel a bit more in control of growing outdoors.:
Normally when growing outdoors we only take advantage of the best period of the year. Marijuana plants grow (VEG) during Spring and early Summer: March, April, May, June, and July. Then typically start flowering the end of Summer (August) and finish flowering in Autumn (September, October, November)
Though it is possible to perform several outdoor crops per year!
Plants that have been under an 18/6 or longer VEG cycle will start flowering automatically.
(I was thinking 24hr veg would be necessary to achieve this. I still plan to veg 24hr for ease.)
Many growers use small pots indoors and transplant to bigger containers when they are placed outdoors. Using a quality root stimulator during the first two weeks outdoors helps the plant to develop a nice rootball needed to achieve abundant yields. During this short period, also make sure that the plant has all the Nitrogen it needs for a lush pre-flowering "stretch" phase.
For Early additional harvests in Spring (march, April, until middle of May latest):
fluorescent or CFL lighting is enough to grow (VEG) autoflower seeds or cuttings for a few weeks.
If we start autoflower seeds or cuttings at the end of the last year (December) or beginning of the new year (January) we can have nicely developed plants in February. Perfect for an early Spring end of March/early April outdoor harvest.
Plants go outdoors during January, February, March.
(Your climate, grow space, and mj strain cold/wet hardiness dependent)
The critical date for cannabis plants grown (VEGGED) indoors and force flowered outdoors to be finished flowering is when the days reach around 14.5 - 15 hours of daylight.
Plants that we put outdoors during January, February, March will start revegetating (REVEGGING) = stop flowering and begin growing (VEGGING) again – since the daylight hours are increasing.
Alchimia is based in Vilamalla, Spain at 42N, this is the same lattitude as the Oregon and California border for reference. May 14th Is the deadline for early Spring force flowered outdoor plants to be finished at this lattitude.
(For me at 47N, May 1st is the deadline for force flowered outdoor plants to be finished. Thats when my days are 14.5hrs of daylight and increase everyday until 16hr daylight on june 21st, then begin decreasing a little each day.
Los Angeles at 34N, June 21st is the longest day of the year at 14.5hrs and then the days begin getting shorter, so you dont really have a deadline for the early Spring force flowered plants.
Important information from the comments in the article:
March 18, 2016 andy asked:
"I stay in northern Cali I moved my plants from 24 hours of light to my greenhouse march 7th to flower my question is will I haft to light dep to keep them from revegging
I plan to harvest first week of may?"
March 22, 2016 Dani Alchimia replied:
"It will mostly depend on the strains you’re growing: I’ve had mostly Indica hybrids that were still flowering by the last weeks of may, while Sativa hybrids often tend to reveg earlier, by early May."
March 25, 2016 andy replied:
"The strain is strawberry cough its a 7 to 8 week flower time. Any advice?"
March 29, 2016 Dani Alchimia replied:
"Pretty fast strain! I would bet you will harvest it without problems."
Planting Time For Large Full Season Outdoor Plants:
Ideally you want to move your large full season plant starts outside to begin veg ASAP after the daylight hrs increase to more than 12 hours per day and climate allows it.
For me at 47N lattitude large full season plants *can* be planted/moved outside as early as the 3rd week of March...with a heated greenhouse probably.
at 42n lattitude (Vilamalla, Spain and the Oregon/California Border) and 34N lattitude (Los Angeles) large full season plants *can* be planted/moved outside as early as april 1st.
These plants will typically start flowering the beginning of August and finish at the end of September/end of October.
For Late Additional Harvests In Autumn (September, October, November), and even later if your climate allows:
We start seeds or cuttings at the the beginning of July so we can have nicely developed plants to put out in August.
The nice thing about Autumn harvests is that we don’t have to worry about the plants trying to reveg since the days are getting shorter instead of longer.
A greenhouse is recommended to combat the weather for a harvest in October/November/December.
More Great Reference Material:
Silverback's Forced Outdoor Maturation Thread:
Silverback's Daylength and the appearance of first flowers Thread:
Silverback's In-Out/ Transition Schedules and Lighting Thread:
Silverback's This years outdoor clone program Thread:
Silverback's Show Your Truly Early Finishers Thread: