Put a 20g Foxtail that I picked up at a local box store (ended up getting it for free long story) about 4 months ago. It’s about 8 ft tall. It had 6 or 7 fronds in good condition when I purchased it. Now barely holding on to the 2 and spear seems stalled. Fertilized, tried various water schedules, root and b1 treatments. Drew a line on spear this weekend so we’ll see. Is it just getting acclimated? Gets full Sun. Not sure what else to do.

If I had to guess, I'd think it needs more water and some fertilizer.  They grow really well here in the swampland of Florida, with daily afternoon thunderstorms and high humidity in the summer.  It seems like it's struggling for water.  So what are you doing now, and what have you used on it?  Hopefully some CA people can offer advice, as your climate and soil are dramatically different than mine.

It was likely field grown and dug up and plopped into a container. If so, it’s still suffering shock. Daily watering would have been the protocol from day one. How much water gas it been getting? 

I think Jim is spot on with his assessment. Also, if the root system was damaged when it was dug up or potted up it could be a long process getting it happy and healthy again.

Usually the only couple times I have had issues with transplant shock it’s been because the roots were cut and damaged before the palm was potted up before being sold to me.

This makes the shock of being put in ground that much harder.

It looks in full sun, which long term is good. Keep watering and fertilizing every 8 weeks until winter sets in. It might take a year or it might not make it in the end. Too early to tell. So  only you can decide how much effort you want to put into reviving it. 
Best of luck with it!

Any "Before" photos? That palm is in bad shape. It might have been grown under shade cloth and now its out in full (10 miles inland from the Pacific) sun.                                                                                                                                            Its only early September so SD still has a number of hot, sunny days ahead. Any way to get a shade cloth over it? It needs lots of water, but that can only do so much. I'd stay away from most fertilizers. That poor palm doesn't need any more stress.                                                                                                                       For stressed palms, I use liquid fish emulsion, a little seaweed extract (growth hormone) and molasses. Tablespoon of each into a gallon of warm, filtered water. Spray on the leaves and drench the soil with the rest.

Edited September 6, 20232 yr by Mangosteen

water the hell out of it every 3 days for a month and youll see improvement but it's getting to the point where it can't afford any more backsliding or its dead