Good Morfnoevight All you happy Thursday Live Stoners!
As promised (to Ms. MOG for eating all of the strawberries last night) I went to the strawberry patch and bought more of these Devine berries and as a bonus they had the years first cherries.......... Score!
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How and Why I germinate in the A-Ok 1.5 inch GroDan starter cube system.
First, all rock wool needs to be PHed in 5.5 PH water (or nutrient bled) due to the lime left over from the manufacturing process. If you miss this step the internal PH can be as high as 8.0 PH. Your seeds will have germinating problems in this environment.
2nd, I soak the starter cubes in 25% strength of week one nutrient solution with Kelp, PH 5.5. Rock wool is totally inert and a seed on soil (natures way) would have some nutrient value. Top layers of natural soil are usually lower in nutrients than just a small bit down.
I use the GroDan holder because it is convenient.
Rock Wool is a very good water holder, a 6 inch cube holds nearly a gallon. This is why you cannot start a seed directly in a 6 inch cube, it takes many days for the cube to dry back, too long for a seed to germinate and they just drown. The A-Ok starter cubes will dry down enough in 36 - 48 hours which is good for the seed. When the seed breaks the top of the cube it is possible for the tap root to be coming out of the bottom of the cube. Picking it up to "Heft" it and then placing it back in the holder has the potential to damage the root, so I do not want to do that. The work around for this is to have a control cube that is prepared just like those that are planted but no seed is installed. This control cube will dry out at the same rate as the planted cubes, until the sprouts start to use more water, by then you should be transplanting. I heft the control cube to determine when it is time to fertigate the seeds and control cube by hefting it.
Cubes that are nested in soil may wick out enough water so the seeds do not drown but it would be hard to gauge when it needs more water?
Once the seedling is up there is little danger of over watering. You need to watch out keeping a humidity dome on too long as it can foster damping off. It is best to just keep the humidity up in the tent around 60% RH when plants are young.
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