Bottom heat
Warmth applied from underneath to stimulate early growth, and to help seeds to germinate or cuttings to root.
bottom heat
Heat supplied to the underside of a container in which a plant is growing.
bract ...
Bottom Heat: Heating plants by subsoil or under bench heating usually for germination or cuttings.
BOTTOM HEAT -- Undersurface heat provided in the soil by electric cables or hot water pipes.
Bottom Heat
Providing a constant heat source from underneath can be very beneficial to seedlings. Temperatures in the potting mix of indoor containers can be as much as 5°F lower than indoor air temperatures.
BOTTOM HEAT - An arrangement used in propagation. Usually electric heating cables will run through the base of the propagation medium. Great for seed germination and cuttings.
Seed flats need bottom heat of 75° to 85°F. I place my flats on top of the fluorescent light fixtures, but you could also put them on top of a refrigerator or near another heat source, such as a wood stove or radiator.
Soil too cold. Add bottom heat., use a germination mat.
Seedlings fall over, cut at the base of the soil
Most likely cause is Damping Off disease.
Put the containers in a warm place where they'll get bottom heat, such as on top of the water heater or refrigerator. Keep the container moist, but not soggy.
A propagating mat under your flats or heating cables buried beneath the seed bed are the best way to ensure that the seeds receive this bottom heat.
Keep container in a shaded area at an ideal temperature of 70-75 and bottom heat of 59F (15C) to speed up rooting. To maintain or increase moisture/humidity place container in a plastic bag using a stick to make a mini greenhouse.
Once the structure is in place, there are lots of options for benches, lights, mist propagation chambers, bottom heating units, potting areas, sinks and computer control systems. You can use drip irrigation, hoses or misters.
The fine seed germinates well if sown on the surface of a good, sterile potting mix, covered with a plastic bag to maintain moisture, and given bottom heat at about 75 degrees.
Plants can easily be started by softwood cuttings, but some bottom heat will keep them from rotting before they establish roots. Spring and early summer are the best times to take cuttings.
Maintenance: ...
Boronias can be propagated successfully with overhead misting and bottom heat, but the home gardener who doesn't have access to these facilities may find it difficult to propagate them.
All herb seeds benefit from bottom heat, so when there is a soil-heating cable
available for early spring sowings make full use of it. Warm compost promotes the
rapid germination of most herb seeds and is particularly useful for gardeners who ...
These are electrically heated closed cases with bottom heat used to germinate seedlings or root cuttings. They should have a thermostat to monitor the temperature within this enclosed environment.
The heat lovers will germinate best if you can provide bottom heat, either with a seed starting mat or with some invention of your own (floor registers, the top of the refrigerator, etc.) Excessive heat will prevent germination, ...
Air temperature of 70 to 80°F
Bottom heating at 75°F"heated cables work well
Sterile potting medium
Good air circulation
Strong light source
Proper watering with warm water ...
Place the pack or propagator where it will receive bottom heat, like on a heating mat or on top of a refrigerator. Try to keep the soil temperature around 70 degrees F. At this stage it is not necessary for the seeds to be exposed to light.
Bottom heat is best so place your containers in a warm spot like on top of the water heater or even on top of the VCR. Alternatively, you can use heating cables or a heating mat under the containers.
In most places, a sunny spot indoors, such as a south-facing window, provides the warm, humid environment young seedlings need. If you don't have sunny windows, use a heating coil for bottom heat and a fluorescent or grow light overhead.
Seed packets carry instructions like "start indoors six weeks before the last frost date." Count back from Tax Day, to start seeds in pots the first week of March. Bottom heat from a seed warmer is handy to speed things up, ...
 See also: Plant, Water, Soil, Spring, Growing
  
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