Proper Shimpaku care

I'm new to the world of Bonsai and I have a few Shimpakus that have died on me. Are Shimpakus more sensitive or am I missing some kind of care for them?
What is the best type of fertilizer for them as well.

Do you take them inside? What growing medium are they planted in?

Please give us more detail on how you have been caring for them. Location, water, fertilizer, etc.

Shimpaku (any juniper) MUST be outside, winter, spring, summer, fall. They do not want a lot of water; allow them to go almost dry between watering. Full sun. Well draining granular soil. Fertilizer every 2-3 weeks in accordance with the label on the fertilizer package.

THanks for your reply. I just took one out of a nursery pot and have put into a bonsai training pot. I used bonsai soil with it as well. I probably have made sure that they have been well watered, but have yet to use any fertilizer. Is there a particular type of fertilizer that is better for Shimpaku?
The Shimpakus that died were still in nursery pot.

Again, thanks for the response.

Is there a particular type of fertilizer that is better for Shimpaku?

Whatever houseplant fertilizer is on sale at your local garden center will be fine.