SAN Marinso tomato colouring

[carly]

My san marinzo tomato plants are a very healthy green and pretty huge! I noticed the other day one of them are starting to get their colour from the base of the tomato. But the colouring is brownish! I thought it was rotten so pulled it and threw it out.... now I have noticed that some of the others on different plants are starting with this colouring from the base too. So I am beginning to wonder if this is normal? I have not grown this type before so wondering if anyone else out there has and if this is normal colouring for the beginning of this type of tomato.
Thanks

[veggiechicken]

Can you put a photo up as that would help us eliminate blossom end rot.

[carly]

Can you put a photo up as that would help us eliminate blossom end rot.

In greenhouse





Outside

[veggiechicken]

Sorry - it looks like Blossom End Rot https://www.rhs.org.uk/Advice/profile?PID=395

[carly]

Thank you for this. Do you know of any explanation as to why my moneymaker and sungolds are all ok?
Also have 4 huge san marinzo tomatoes on one plant that haven’t been affected by this yet

[veggiechicken]

I've had BER on one of the Black Icicles this year - but the other plants have been fine. I've always put it down to erratic watering - not keeping the compost moist enough. Maybe that pot is drying out more quickly than the others?

[Thelma Sanders]

Some varieties suffer more than others, San Marzano (if that's the one you are growing) are one of the worst for getting it. I stopped growing it for that reason.
Individual plants can be better or worse, perhaps a little more shade, perhaps a tad more water, you'll never know why.
A high nitrogen feed can make BER worse, so avoid those at the moment.
A seaweed feed or spray may help to prevent it, but it's also very important to water regularly, so there is a constant supply of water to the roots, rather than wet-dry-wet.

[FuzzyFeltDeath]

A lot of my greenhouse tomatoes had BER, the bigger one's where all affected.

Not a single outdoor one had so much as a sign of any BER, so must be down to the extra heat (greenhouse gets a lot of air and hasn't gone above 27oC). I water everyday and water then soaked, so might have to start giving them a second soke too.

I've given them all some woodburning ash just in case it's a calcium thing, but I'd have money on it being this heat.

[nickdub]

Its linked to heat, but its basically about water being available at all times the plant needs it - because the plants in the GH are growing in hotter conditions they need more water and the peaks in demand are steeper.

It would be interesting to compare plants grown in the border ie soil in a GH and those in containers - my guess would be that plants in borders would have fewer problems due to the extra root run.

[carly]

Some varieties suffer more than others, San Marzano (if that's the one you are growing) are one of the worst for getting it. I stopped growing it for that reason.
Individual plants can be better or worse, perhaps a little more shade, perhaps a tad more water, you'll never know why.
A high nitrogen feed can make BER worse, so avoid those at the moment.
A seaweed feed or spray may help to prevent it, but it's also very important to water regularly, so there is a constant supply of water to the roots, rather than wet-dry-wet.

Ahhhh wasn’t aware these type were more prone to it. Such a shame as they are huge and beefy

[cwmmawr]

[
It would be interesting to compare plants grown in the border ie soil in a GH and those in containers - my guess would be that plants in borders would have fewer problems due to the extra root run.[/QUOTE]


That's a good point I have three san marzano plants doing well in the greenhouse but all in a border

[carly]

[
It would be interesting to compare plants grown in the border ie soil in a GH and those in containers - my guess would be that plants in borders would have fewer problems due to the extra root run.

That's a good point I have three san marzano plants doing well in the greenhouse but all in a border[/QUOTE]

Ahhhh, all mine are in containers. Might have to try one in the ground next year