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I planted some tomato plants in August in pots with 70% soil and 30% organic vermicompost. Plants started to fruit from mid November, but even today those tomatoes are very small and green (and hard). It has been 1 month and they are not turning into mature ones. Are the plants missing something?

Is 30% vermicompost not enough or should I use some NPK fertiliser?

What is the usual time for tomatoes to turn red and mature?

  • My tomatoes was planted in April (Autumn), lasted straight through winter and started flowering in November (Spring). They are almost ready for harvest. – Rudolph Dec 20 '13 at 8:31
  • Has it been cloudy? Tomatoes don't care much about day length (currently 10.5h in Jaipur), but they DO like their light: journal.ashspublications.org/content/132/4/459.full – Wayfaring Stranger Jan 2 '14 at 22:19
  • yes sometimes its cloudy here.. but after spraying NPK some are getting ripen :) ... – Saurabh Jan 3 '14 at 5:33
  • @Saurabh What tomato variety was it? – Shule Mar 1 '15 at 0:01
  • @Shule I am not sure about the exact variety but that seed packet had "Hybrid Tomato seeds" on it. – Saurabh Mar 3 '15 at 6:06
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You should be using NPK fertiliser, preferably a commercially produced tomato food, or at least something with an NPK roughly approaching 10-10-18 for a liquid feed, or 18-18-21 for a foliar spray.

Your average temperatures and hours of sunlight also make a difference - in the UK, in summer, average ripening time from swelling of the fruit to full ripeness probably 2-4 weeks.

UPDATED RESPONSE: No, your NPK fertiliser isn't quite right - if you look at the numbers I gave in the first paragraph, the 'K' part is much higher than the other two figures. This is the formulation for tomato food, in other words, the nitrogen and phosphorus (N and P) are lower than the potassium (K).

  • I have NPK (19-19-19) fertilizer... will that work? how much should I use? Current temperature here ranging between 50 to 75 fahrenheit. Getting good sunlight of around 10-11 hours. – Saurabh Dec 18 '13 at 6:49
  • Thanks!! i am trying to get NPK 18-18-21.. lets see if this helps! – Saurabh Dec 23 '13 at 14:18
  • 11-11-18 will do it if its something you dilute and water in. – Bamboo Dec 23 '13 at 18:01
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Where are you located? What kind of temperatures are your plants growing in? Tomatoes like temps in the 60-80 degree range (60s or better at night, 80s during the day) for best growth. If temps are very far outside this range on either side, it may have problems ripening fruit.

  • I am located in Jaipur, India. Current temperature here ranging between 50 to 75 fahrenheit. – Saurabh Dec 18 '13 at 6:47

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