chilean guava

Has anyone grown chilean guavas from seed? I had a lot of seed to sprout but they are not growing much larger than three inches after about 8 months. Some have dark green leaves but have bud dieback. Others have yellow leaves, and do not grow. It's a mild climate, they're in small pots, some are in sand and compost. Others are in a nursery mix and I think these got too much water, one died, but the others are well-drained. Thanks!
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