Dont bother with all the expensive crap that they market, i mean , at the end of the grow you will have done this to save money on weed right? so save even more money and resist all the gimmicks in the shops , put a teaspoon of molasses in a litre of hot water , add 4 drops of lemon juice, stir until all the molasses have dissolved and allow to cool, add to a spray bottle and spray your plants with this every other night after lights off for the last 2-3 weeks before your final flush, hey presto ,your buds have swollen as big as dolly partons tits !!!!!, also at the start of the 2nd to last week , reduce the lights an hour every day , until you have done your last flush (about 2 days before harvest) then turn and keep your lights off permanently for 36 hours , this will also aid bud growth as the plant is fooled into producing more resin to protect the flowers as the imminent longer dark nights the reduced light period was mimicking , this is what i do and it works well for me, my last autoflowering WW x Cheese reached 30 inches in height by harvest time and produced 34 grams of nice juicy buds from one plant , it took just 2 weeks from seed to start flowering and another 6 weeks to harvest , by the way , i planted in half john innes potting compost and half coco coir, I PH 6 'd my water EVERY TIME and once flowering started kept my humidity at under 40 % , my growroom temps were often over 85 f due to the 600 w hps in a small closet , so to counteract this for my next grow cheaply , i will add co2 tabs to my water as this will be far cheaper than using more electricity on fans and what not, my odor control was purely a product called neutradol which im told is as effective as the US product ONA, i had 4 pots of it open just in front of my 7" osc fan , and completely eliminated any smells , hope this info is of use to someone, other than the co2 tabs i do not intend to spend any more money on equipment for my next grow and so far (excluding the cost of seeds ) i have spent just under 150 £ on everything , my current plant is my second and already made my money back on my 1st plant, i grow for personal use only and so far my electricity has cost me an extra £20 per plant in just over 3 months , i germinate my next seed when i have 3 weeks left to go on the current one. I use a 125 watt cfl bulb 4 inches above the seedling till its 2-3 weeks old before placing it under the main 600 watt HPS