Soil blocking can be a bit of a pain - getting the moisture level right in the growing medium, packing and setting out all of those little squares - but I've had fewer problems with disease or pests since I went to soil blocking. The plants seem to thrive (perhaps because the blocks use more soil than other methods) and I can easily clean and reuse trays.
The other cool thing about soil blocking is how they are designed for repotting, i.e., 'bumping up.' The model I use has 1/2", 1 1/2"* and 2" squares. The 2" squares come with a 1/2" square insert so that a nice clean square is molded in the soil block into which the 1/2" blocks fit perfectly.
A full tray of 1/2" blocks is 300 blocks. Since the same tray holds only 48 of the 2" blocks, I do sometimes face a dilemma - fill lots of trays, or cull to the best seedlings. My general approach is to plant 60 of each variety in a 300 block tray, and then keep the best of those.
This method is probably not efficient for large-scale planting, but the quality we get from each balances it out for us. Bumping up today:
Veronica Alba (white Veronica)
Iceland Poppies 'Champagne Bubbles' (I usually have tons of these but for some reason had poor germination this year. Unfortunately, we've run out of seed)
Himalayan Poppies
Stock
* The 1 1/2" blocks are used for starting larger plants that grow quickly like zinnias, amaranths, tomatoes and even melons. They will not be transplanted into larger sizes.
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