I used to use walls of water with great success....I would like to try an make my own to reduce cost..those vacuum seal bags might work....yeehaw....
i apologize for taking down my pics. this site had 10 monster females averaging 2# each using this technique. no premature flowering. leo spotted the garden. i had posted pics of this garden w/o scrubbing the pics of gps coordinates. i had two other gardens busted by leo this year as well. security comes first. always next year.
don't use the mini greenhouses after temps. get too high in direct sun. use shaded areas for later in the year. i inserted my seedlings sprouted from paper towel technique into the mini greenhouses 4/15 at 35 degrees n.
i will have backup mini greenhouses at all sites next year. i will have plenty of extra seedlings going for each site as well. bugs, criitters still take their toll but the losses are sustainable if you over palnt in multiple mini greenhouse areas. i'm using 4" galvanized irrigation line stakes to secure the pots into the ground and secure the tops (clear plastic) to the bottom containers planted all the way into the earth (flush). another concern is flooding. plant on small slope ( slope to drain). use daiatomaceous earth inside the mini greenhouse contraption and sprinkle liberally outside the perimeter. i used logs buried tightly around the perimeter and put sticks in the ground pointing up around the mini greenhouses to help repel critters.
get the stuff into the grow area in the winter when ppl aren't thinking marijuana patch thoughts. all you need to do in the spring is bring in the seedlings. i leave out 5 gallon buckets under trees to catch rain for the spring planting and ultimate spring transplanting into holes by transplanting established seedlings with good rootballs 3 weeks later ( 5/1 for me).
i read a post on here from silverback about him starting a seed indoors 2-3 weeks prior then just germing his seeds on april 1st at 38N and planting end of april 1st of may..in his post he said he didnt see any differnce in starting them earlier indoors..infact the post said he say better growth from the ones started later due to it being alot warmer..so imo its just a waste of time and effort doing all that..if i can find that thread then i will post it but i have done the same experiment except i started mine outdoors march1st and planting april(with the freebie regulars bc i didnt care if they died..i only grow feminsied now) 1st and then germing on april1st and planting may1st and i have come to the same conclusion that my plants that are started when warmer grow alot faster then planting earlier..everone has their own techquine and im not saying u all are wrong bc they are no wrong way imho..cannabis has to have a certain ground temp for them to thrive!
Better growth when started later, sure. But that extra three weeks allows the plants to flower weeks earlier. That can make all the difference when your growing season normally is only a 100 days long.
It goes without saying that the closer to the tropics you are, the less use you'll have for this method.
im far from the tropics growing season ends here oct 25-31 sometimes before that but as i said there is no wrong just my experience with it and it does nothing for me
dam u are a long way up..ya some sativas i can grow some i cant all depends on what ole mother nature wants to give me..i would love to be able to do a greenhouse but so many rippers and cops around here id doubt i would get away with it..i can only put them in the bush to try and get some satThe very south of Spain is at 38th parallel north like you are, so sub tropical if you're not up in the mountains.. From my perspective that's a very southern location.
When I was living in Spain I had sativa plants outdoors in january, they flowered but didn't really grow. I'm sure a mini greenhouse would have helped them along as the plants on my windowsill grew just fine.
I'm at 64' north. The temperatures in May range between -5c and 20c but usually are around 15c during the days. You need to have your plants up before June if you wish to finish them by September so a mini greenhouse helps a lot, the plants can grow on sunny days even if the temperatures outside the dome never exceed 15c.