Excuse me; I thought I had 5-10-10, but it was 5-10-5. I got it from Amazon: https://www.amazon.com/dp/B00I4CU6RS/

(You can buy only 1, but it seemed more cost effective to buy 6, and store anything unused.)

There are other brands of 5-10-5 on Amazon (such as https://www.amazon.com/dp/B001EEU6DM/ ), but the above is what is convenient to me. (My days of carrying anything near 40 lbs. are long over.)

You can also get 5-10-10, but not by the same manufacturer (so far as I can find): https://www.amazon.com/dp/B000OVCHQA/

And also superphosphate: https://www.amazon.com/dp/B00494GB0Q/

There is also this 9-18-9 time-release version, which (per the label) also has sulfur: https://www.amazon.com/dp/B00G8FF150/

Thanks to whomever commented on using a fertilizer with micronutrients. I am in search of something suitable to use along with the 5-10-5, which I can also use elsewhere in the garden.

I get a 50 lb bag of 6-20-10 for around $26. I didn't fertilize last year, but I will this year. So I'll be picking up a new bag sometime in the near future.

Where do you buy that, Rob?

Horizon landscape supply. They also have it in 25 lb bags. I reuse those yellow plastic kitty litter containers for fertilizer. (and for sprinkler parts, drip irrigation, etc...)

I went to Horizon Landscape and couldn't find any product list to buy.........