I have it worse here in San Antonio TX. Our preceding and upcoming weather:

http://www.mysanantonio.com/news/weather/

... which is Jul/Aug weather here since early June.

My M. Blue Java loves this sun/heat and is growing great. But starting out the same size and right next to it, my M. basjoo is growing at half the speed and looking a little droopy. I'm guessing basjoo isn't going to die (all the original leaves burned up and were replaced), but may be holding back from the all-day sun and 95F.

Certainly, my 4 Castor plants droop dramatically in the afternoon but bounce back overnight.

My 9 new Majesty palms are already responding well to being moved to shade vs full-sun. Spears pushing up faster and deploying faster.

So, is cold-hardy M. basjoo not really thrilled to be under intense sun and heat?

My basjoo are in full sun, and they have been receiving the low 90's here, and later on will withstand 100's. So, basjoo can be thrilled about the hot weather, but that is not without some problems. with the dry heat we recieve here, water is essential, good drainage and aeration, fertile soil, and coordinating proper sugar production. Wind is always a factor for making the plant always in repair mode here, and helping in water loss. All my musa, including basjoo, are planted with rotted manure including non-rotted llama manure( for aeration, pumice can be a alternative). They are suplemented with liquid kelp every two weeks, with fish emulsion as well. That takes care of the problems with droopiness due to lack of nutrients. Low humidity problems can have their areas of attack on the plant, and simply keeping the top layer of soil slighlty moist on hot days can improve droopiness. Lastly, root development. Sometimes, a unhealthy soil can attribute to poor root development, which cannot support top growth as quickly as you want. On a monthly basis, no matter if the musa is in the ground or in a gallon container being propagated from, I water in PlantShield or any other helping fungus. Mychorizae is great to add in aiding the plant to puch through stressful times, and building up protection against harmful bacteria, fungi, mineral salt buildup, and enviromental stress. So, go down the list, make sure over-fertilizing is not the issue, and improve the soil, not just with compost or manure, but aeration, drainage, and organic ingredients.

Hopefully it will aclimatize a little better. It doesn't really get much hotter here than it's been and the plants seem to recover really quickly. They've practically doubled in size in the last two weeks anyway. Funny thing is that my catawba rhododendron is thriving just a few feet away, but in a shady spot.

Sounds like it just needs a bit of time to establish...although if it is growing so rapidly, sounds like it is doing pretty good!
Have you got it mulched?

seahorse

I do have a couple inches of mulch on them. My fertilizer is heavy on the nitrogen, so I'm going to get some with higher potassium. And keep pouring on the water....

Thanks again.

I live in nw ohio- limestone country, and boy do we have clay. It dries out fast, cracking all the way! My basjoo suffered a late frost and lost all leaves, only to return and grow S-L-O-W as molasses. Now it's throwing a leaf every few days! Being frustrated, I started adding fertilizer to every watering (about 3x per week). Neptunes Harvest fish/seaweed mix. Only I use so little that it works out to be the same as one strong fert every two weeks. Maybe a little more. I also mix in some peat humous (spelling?) so it's nice and black water. Could be chance, weather or luck. Could be fert, water or peat. But it's working. Been cool lately too. Hope this helps!