The main trace elements in fertilizers are calcium, magnesium. I wasn't sure if I should not interfere and just watch them grow, even if slow, but was leaning toward trying a weak fertilizer. Some trace elements are more important than others, but each nourishes a plant in its own way. If you notice the plant getting yellow then you can use fertilizers twice in a row, but if it gets a dense dark green color then youll need to lay off on the. You can continue this feeding program until the seedlings go into the garden, or switch to less frequent full strength feedings, every 7-10 days. Mix the fertilizer at half the recommended rate and apply it twice a week. To get approximately two pounds actual nitrogen per 1,000 square feet, use: 2 1/2 tablespoons for a 10-8-6 fertilizer. But once the second set of 'true' leaves appear, you should begin feeding your seedlings with a dilute fertilizer solution. The amount of fertilizer to use per hole will vary depending on formulation. There were a couple that looked odd that I thought of grafting to Pereskiopsis rootstock but waited too long and they shriveled away and a couple others that looked OK but didn't grow roots for mysterious reasons and shriveled away. All the food that's needed to sustain these first leaves is contained right inside the seed. I was hoping to keep them in a more humid environment, which seems more forgiving if the watering is slightly neglected, until they have a bit more size. In past misadventures of starting cactus seedlings I've found that if their soil mix dries out in dry atmosphere then they quickly shrivel away to nothing. Yes, I made the mix with keeping it in a humid environment in mind. The Echinocereus engelmannii variegatus seem to grow quickly, the quickest, regardless of the poor nutrients. All the food thats needed to sustain these first leaves is contained right inside the seed. Strangely, the Escobaria organensis seedlings take several days to dry out but they haven't rotted, either. When To Start Fertilizer Your Brand New Seedlings Once your seedlings get past those first 4 leaves, the cotyledons and the first 2 true leaves, you can start. Of the various kinds of cacti seedlings I have, most need a bit of water every two days and that is with the dome on the seedling tray. Of the various kinds of cacti seedlings I have, most need a bit of water every two days and that is with the dome on the seedling tray.
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