Growing San Marzano Tomatoes in Kratky Hydroponics – Update: Month 1

San Marzano Tomato 1 Month, In Kratky Hydroponics

Its been a month now since I planted my San Marzano Tomato seeds, and I am still in awe! I honestly can’t wrap my head around how fast these tomatoes are growing. I expected like one or two leaves a week, not one or two leaves growing every single day! Maybe all tomatoes grow this fast… I’m a first time grower and I am honestly hooked.

First, lets see how they have grown over the last few weeks:

And now, be amazed:

San Marzano Tomato 1 Month, In Kratky Hydroponics
San Marzano Tomato 1 Month, In Kratky Hydroponics

They have doubled their size in one week! I said they were growing fast, right? One of the seedlings (one on the left in photo above) was a little slow in recovery after transplanting, so his growth is a little slower than his brother. Perhaps he experienced a bit more shock when transplanting.

San Marzano Tomato 1 Month, In Kratky Hydroponics
San Marzano Tomato 1 Month, In Kratky Hydroponics

I’m not going to even bother counting how many leaves the bigger of the two has now. Last week he had nine branches, and I as already impressed. He grows new branches so fast that I wouldn’t be surprised that by the time I finish counting there would be another emerging.

San Marzano Tomato 1 Month, In Kratky Hydroponics
San Marzano Tomato 1 Month, In Kratky Hydroponics

Once a brach seems to get old enough, new smaller leaves and branches start to emerge from those.

Here is a close up of some of the newer growth. I think this growth has emerged since last night.

San Marzano Tomato 1 Month, In Kratky Hydroponics
San Marzano Tomato 1 Month, In Kratky Hydroponics

The growth is just impressive. We’d be in trouble if tomatoes became sentient and tried to take over the world.

San Marzano Tomato 1 Month, In Kratky Hydroponics
San Marzano Tomato 1 Month, In Kratky Hydroponics

I can safely say that he has doubled his size in just one week! He is now 12 inches, or 30cm, tall. Last week he was only 5 inches, or 12cm, high! It seems that the more leaves he grows, the faster he grows. With 6 inches of growth in one week, I am super excited to see how much he grows in the coming week.

Have you grown tomatoes before? Do they honestly grow this fast, or is he growing faster in the hydroponics? Have you any tomato growing tips to share with a first-time grower?

2 thoughts on “Growing San Marzano Tomatoes in Kratky Hydroponics – Update: Month 1”

  1. hi, what are your nutrients? I started using maxibloom it was fine until about 3-4wks in when I started getting edema. I since switched to masterblend starting at .6/.3/.6 for 1/2 gallon and now have up the concentration to 1/.5/1g for top off. I noticed new edema tonight and leaves were browning. I don’t have thick folliage like you but new leaves are forming. They’re just not thriving. I’m using 4000k 100w pendant lighting (rapidled) for about 17hrs a day. I don’t believe airflow is an issue for me as it’s not very lush.

    1. Hi Matt,
      I am using MaxiGrow, one small spoon with approximately 2.5 of water (sorry I’m sick at the moment so its a bit too hard to do the math properly). It seems to come out at the correct nutrient levels for most of my plants, so I just use that ratio across all plants in my grow room (except a couple special cases).

      I have found time and time again the edema issue is a matter of airflow. My grow room getting too moist (it often doesn’t feel humid to me but obviously enough for the plants), and a major lack of air movement. Installing a fan has solved the problem almost every time.

      You said your leaves weren’t that dense, but once they do become dense you could go in a prune them a bit. Remove extra branches (such as ones that aren’t fruiting or flowering), or just trimming some of the leaves off at their stems.

      The yellowing leaves could be a different problem however; a number of things can cause yellowing. I would suggest improve the airflow, and then keep an eye on the yellowing and see if it gets worse. You can probably cut off the yellow leaves when they start turning to help increase space between leaves for airflow as needed.

      I hope that helps.

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