Many of our customers are confused as to the relative merits of timber and aluminium framed greenhouses, here Nathan James Dodd answers some of your frequently asked questions.
Heating will be a deciding factor on the variety of plants you are able to grow in a greenhouse and the number of plants that can be kept over winter. Here, Robert Hall goes through the pros and cons of the different types of heating that are available.
You have a choice of tree main types of greenhouse heating, electric, gas and paraffin. Of course all have their advantages and drawbacks, and it is important to take these into consideration when choosing a method that will suit your needs and situation perfectly.
A minimum temperature of 7C is needed to keep most tender plants happy, so you must think about insulating and heating the greenhouse if you want to make the most of it throughout the year.
Easy to use and reliable, electricity is clean and doesn't create any odour or fumes. Again high temperatures can be achieved and controlled fairly accurately, and cost effectively, by a thermostat. Fan heaters provide more uniform heat and can be used to cool the greenhouse during the summer.
Propane, butane, even mains gas are easy to use although again harmful fumes may be a problem. Initially more expensive than paraffin, gas can be controlled by a thermostat and high temperatures may be obtained if required. You always need a spare gas cylinder at hand.
These heaters can be economical to buy but, without a thermostat, temperature control is difficult and they need daily maintenance with frequent re-fuelling. Other disadvantages are that humidity and condensation might be a problem and toxic fumes, that can be harmful to plant health, may be emitted.
Solar energy or wind turbines may become a consideration in the future but at the moment they are far too expensive due in part to the poor heat retention qualities of a greenhouse. Spent cooking oil is used occasionally commercially but is messy, smelly and not really suited to small scale operation.
Once you've heated your greenhouse, you need to retain the warmth. Clear polythene could be used for double glazing your greenhouse, but it has little insulating effect and clings to the glass when wet, further minimising its potential.
But when manufactured with the addition of clear bubbles, polythene becomes extremely attractive. The bubbles trap pockets of air, creating the same effect as sealed units in double glazing by providing a still air barrier.
Bubble wrap can be fixed into any metal greenhouse by using special plastic fastenings that slot into the channels of the aluminum frames. It is then held in place with a cap that secures it tightly ensuring a 1" insulation gap. With a wooden greenhouse you can simply use drawing pins.
Remember to place the bubbles towards the glass, and ensure good ventilation. Never completely seal up a greenhouse. Once in place you will discover that during daylight hours the warmth from the sun's rays passes through the bubble glazed lined glass to heat the greenhouse.
When the outside temperature falls, the effect will be to retain this free heat. This results in a 70% increase in daytime temperature during the cold season, and a 60% increase at night.
Robert Hall, senior partner at GardenSite.co.uk has been elected to sit on the Garden Industry Manufacturers Association (GIMA) Judging Panel for 2017. The news was announced on 31st March 2017 on the GIMA website.
April, particularly if you are on holiday over Easter, is the time when gardeners, whatever their level of enthusiasm and skill, want to get into the garden. Andy Taylor looks at the gardening jobs that can be achieved this month.
With rising water temperature and kinder weather, April is a good month for pond maintenance and Dan Everton takes a look at the jobs that need to be done this month.
Pay attention to your lawn in the spring and Andy Taylor reckons you will receive dividends later in the year.