Herbm - respects for your good taste. The SSH...not only my fav grow but nearly my fav smoke too (Nev and Mango Hazes just edge it for me. Well done Shanti and Nev - from all the community.)
Absolutely shite in the UK greenhouse, though!
I really hope you prove me wrong..Just promise that if a semi-decent harvest starts to develop you'll ditch the tomatoes. They are notorious carriers of botrytis and cause havoc in the soil with bugs and insects (which is why it is hard to grow them in the same place 2 years in a row...) How many tomatoes would you swap for just 1 good ounce of the SSH?
Haha - how many times have I dumped spare indoor plants in the greenhouse only to be disappointed? The only time I was pleasantly surprised was with a white skunk which is now called Shark Shock (but was called something else back then...) Even then I reckon I could've done a lot better with a good early skunk and a couple of auto-flowerers either side...
Still, if you have green fingers (and I'm sure you do) you will always get SOMETHING..
On the other hand, a heated greenhouse really would increase your chances of a good harvest. I use a green electric greenhouse heater. They are sold all over the place for about 20squid. They have pros and cons.
The trouble with them is that they blow the heat out and this is damaging and desiccating for leaves and buds. You have to aim the air away from your plants which means that the heat isn't going exactly where you need it. Still, it will heat up the whole g/h generally. Try not to blow the hot air straight out of the window! A much better option is heated tubes, kind of like underfloor heating, which radiate heat but these are more for the professional (again, someone prove me wrong on this and tell me where a cheap option can be found, please)
You will need ventilation to avoid moulds. A good extractor is best - but unlikely and expensive for a 6 ft by 6ft g/h and definitely increases heating costs. The easiest way is to use the window! By hand is a pain, better to get one of those auto open/shutter things. They are cheap and work by gas pressure, I think. Again I recommend these because they are thermostatic - you can set the temps at which they open/close, just like the green electric heaters.
The trick here is to strike a balance between the temp at which your heater strikes up and the temp at which your window opens and shuts. If the window
opens too early your heater loses effectiveness, too late and humidity becomes a problem. Likewise with the heater. You need to get a 'feel' for the climatic micro-system (wow - great phrase).
It is worth repeating something that I know you (herbm) and I don't need to hear again but will be of possible life saving importance to less experienced growers...
ELECTRICITY AND WATER DON'T MIX. If you can't do it safely, don't do it at all. Really.
The plug for my heater runs OUT of the greenhouse into a kind of plastic mini house which is where the garden electric cable runs to. This is totally rain and dog proof and STURDY. There are no electric points in my greenhouse. There is a surge protector at the other end of the garden electric cable, where it plugs in inside my house...At no times are any electric points or items just left on the ground. In the greenhouse, electric items, such as heaters, should be raised ABOVE the level from which you water (somewhere between knees and hips for me.)
My overall view on heaters is this.. The whole point and joy of outdoor/greenhouse growing is that you are using the sun and ground and air instead of HPS's, pots and fans. These things are natural and best of all, FREE. Heaters are very expensive. Try to choose varieties that come in before the need for heaters or which will come in with only minimum heater use (around the end of October/beginning of November) most skunks are good for this - but some can be mould susceptible so choose carefully, the F1 skunk hybrids are usually slightly hardier.
That said, if you don't mind spending the money and you are a confident and attentive grower with a little bit more experience, greenhouse heaters will greatly increase the range of varieties you can choose from, just like the greenhouse did in the first place.
Swap the toms for a heater then you can smoke ten SSH joints for me! (outdoor is always more psychoactive than indoor, too, you lucky grower)
Grover Sativa
(actually, cola bro is my little brother. I really should get my own login.)