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Yes. I don't see too much of a problem with these plants; especially the first ones. Are you sure those browned leaves were not from the nute burn a few weeks ago? Also, I don't think bone and blood meal would burn plants to easily. They are both organic elements and organics rarely burn plant; especially mature ones like you have there. Therefore, I don't think a flush is even necessary. It won't hurt though unless your soil has poor drainage. Every time I water my plants I give my one gallon plant about three quarters of a gal to drink. This causes plenty of water to run out the bottom and flushes the salts down. A flush on a 3 gallon pot would be at least 3 gallons; a thorough flush would indeed be 6.
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