You might want to contact" berry-nut 4b-SouthWestWI " http://forums2.gardenweb.com/forums/load/fruit/msg0202381110877.html

I didnÂt notice anything out of the norm for planting and growing instructions, water well, donÂt over-fertilize. It also, just may not be suited to the soil into which it was planted. Some like sand Âsome like clay, or at least tolerate it.

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Hardiness zone 3
Maximum height 1,5m / 5'
Maximum width 1,25m / 4'
Exposure Sun
Notes : From Michigan State University, U.S. a mid-late new variety with the largest blueberry on the market today. We were really amazed by the size of his fruits. Self-pollinating.

ItÂs a new variety

"Bonus shows promise as a large fruited, late type, but is little tested."
http://web1.msue.msu.edu/fruit/bbvarbul.htm

"Very good hardiness and very good productivity. Bushes are vigorous and fruit is very large, very firm, medium blue with very good flavour. This bush has the largest blueberries we have ever seen. 'Bonus' blueberries are quarter to half-dollar size. Largest blueberry on the market today."
http://www.heartlandblueberries.com/Plants_for_sale.php

more info.
http://www.blueberries.msu.edu/pdf/BlueberryVarsForMich.pdf

http://www.therussellcorporation.com/OldSite/berries/blueberry_types.htm

Where did you get your Bonus plants from? I have some Chandler plants but wouldn't mind trying a couple of Bonous plants.

I planted a Bonus from DeGrandchamps on my property several years ago. It plugged in nicely. I also installed 4 other Bonus plants in various sites and never observed any problems with them.

Elliot is my slow grower. It's a really good cultivar for a u-pick if you want to extend the late season for a month over other lates. But it is a slow establisher.

Bonus is a good variety for Mid-season. I love to plant some Elliot for late season production. We like to eat fresh blueberry and in the High season we have Blueberry coming out from our ears then suddenly none. I think Elliot will give us a late season supply.

I went to a local blueberry farm in Central Wisconsin they have bonus blueberries they were huge beautiful and very tasty