Using Cal-Mag+ for BER

Greatgardens · September 13, 2020

I had a severe bout of BER this season with one variety. It was an F1, and BER was about the only fault I could find (tasted great!). But nearly every tomato showed rot or at least the start of it as a small depressed scar on the blossom end. So far I've lost about half the tomatoes produced. No watering issues that I could see, and plenty of Dolomite in the mix. It was not a fresh potting mix -- it was last year's mix freshened with new fertilizer and lime.

This was grown in a Gro-Bag, and in fact the same Gro-Bag that I grew Stellar F1 in last year. Had maybe 1 or 2 Stellar fruit with BER -- nothing remotely like this. Too late to do anything about it for this year, but for next season:

If you use a calcium supplement...
How do you use Cal-Mag+ (or similar) in your containers?
How do you apply it in EarthBoxes?

I'm looking for type, quantity, and frequency of the application. I'm also curious if you have ever had a severe occurrence of BER?

September 13, 2020	#1
Greatgardens Tomatovillian™ Join Date: Feb 2010 Location: Indiana Posts: 1,124	Using Cal-Mag+ for BER I had a severe bout of BER this season with one variety. It was an F1, and BER was about the only fault I could find (tasted great!). But nearly every tomato showed rot or at least the start of it as a small depressed scar on the blossom end. So far I've lost about half the tomatoes produced. No watering issues that I could see, and plenty of Dolomite in the mix. It was not a fresh potting mix -- it was last year's mix freshened with new fertilizer and lime. This was grown in a Gro-Bag, and in fact the same Gro-Bag that I grew Stellar F1 in last year. Had maybe 1 or 2 Stellar fruit with BER -- nothing remotely like this. Too late to do anything about it for this year, but for next season: If you use a calcium supplement... How do you use Cal-Mag+ (or similar) in your containers? How do you apply it in EarthBoxes? I'm looking for type, quantity, and frequency of the application. I'm also curious if you have ever had a severe occurrence of BER? Last edited by Greatgardens; September 14, 2020 at 06:48 AM.