Growing Lettuce

lactuca sativa : Asteraceae / the daisy family

Jan F M A M J J A S O N Dec
  S S                  
      T T              
      P P P P          

(Best months for growing Lettuce in USA - Zone 5a regions)

  • S = Plant undercover in seed trays
  • T = Plant out (transplant) seedlings
  • P = Sow seed
  • Easy to grow. Sow in garden, or start in seed trays and plant out in 4-6 weeks.. Sow seed at a depth approximately three times the diameter of the seed. Best planted at soil temperatures between 46°F and 81°F. (Show °C/cm)
  • Space plants: 8 - 12 inches apart
  • Harvest in 8-12 weeks.
  • Compatible with (can grow beside): Carrots, Onions, Strawberries, Beets, Brassicas, Radish, Marigold, Borage, Chervil, Florence fennel, leeks.
  • Avoid growing close to: Parsley, Celery

Your comments and tips

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30 Jan 13, (Australia - sub-tropical climate)
Hi Kate! What a great idea. My slight adaptation is I am not trying too raise great quantities so I put two sets in each ziplock bag and tuck a plastic marker tag inside each of sets saying what it is (with a Chinagraph pencil - they don't wash off) and the date when started. Regards, John
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26 Jan 12, Trev (Australia - temperate climate)
During germination you may need to keep them iout of sunlight. I start mine in the shade completely. They only need water to get started. You can start giving them some sun when the leaves appear.
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19 Jan 12, rob (Australia - temperate climate)
the only thing that i can think of is the amount of sun that the beds are getting and the seeds need to be kept moist to germinate
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28 Nov 12, Jim (Australia - temperate climate)
Try covering the seeds with 4 or 5 layers of newspaper and watering the paper to keep them moist and dark.
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03 Mar 12, gary ellard (Australia - temperate climate)
try putting hessian bags over the area where the seeds are planted and keep moist . this will work for nearly all planted seeds and they will germinate a lot quicker than stated on the packet. YOU MUST KEEP THE HESSIAN WET/DAMP.
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30 Dec 11, tammy (Australia - cool/mountain climate)
I have grown letuces for the first time and they are growing really well BUT each lettuce has 2 or 3 heads on it. There is the main one in the middle and they all either have another one or 2 heads growing off the side. they are beautiful and firm. IS THIS NORMAL, i have really good brown dirt in yard and added a bag of organic animal manure to soil 2 weeks before planting.
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04 Dec 11, Simon Adelaide Hills (Australia - temperate climate)
I have planted Cos lettuce for the past two years while they grow well they do not seen to develop a good heart. They are in good sun for 3/4 of the day in well draining soil. The soil was prepared with home compost and pea strall, any thoughts please
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12 Dec 11, Randy (Australia - temperate climate)
Cos lettuce don't develop a heart like eg iceberg lettuce. Just keep taking leaves from the outside as it continues to grow.
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27 Nov 11, katy (Australia - cool/mountain climate)
Hi, I planted 4 lettuces 9 weeks ago and they have grown into great little bunches. I pulled some of the other day to put in a sandwich and it was terrible bittery....help!! they are only planted next to tomatoes..
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13 Dec 11, Tracey (Australia - temperate climate)
Hi Katy 9 weeks is a long time for them to only produce little bunches. For mild sweet flavour lettuce need to be grown fast - that is, plenty of water and plenty of available nutrients in the soil, including plenty of available nitrogen. Otherwise they can be quite bitter. Is it possible they got too dry or that the soil was not amended before they went in? Fortnightly feeding with something like worm tea can help if you're growing in containers or still building up your soil. Lettuce also tends to become bitter if it is going to seed, but if that's the problem you would be able to see the central flower stalk forming.
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Agriculture: Molybdenum deficiency is often only revealed in LOW YIELDS. Mo deficiency is the most widespread deficiency after Zinc & Boron. Excess molybdenum in pastures can give rise to animal health problems (in reality it is the nitrogen - Mo acts as bottle neck, so that plants can't uptake a lot of nitrogen -- in high Mo soils nitrogen uptake can be too high-- Ireland -- maybe investigate Denitrifying bacteria, microorganisms whose action results in the conversion of nitrates in soil to free atmospheric nitrogen - also useable in areas where nitrogen is washing into the lakes, rivers and streams). ********** Sometimes Molybdenum (Mo) deficiency can appear like a nitrogen deficiency ************** - it makes sense since Molybdenum (Mo) is required for plant assimilation of nitrogen (both atmosphere and soil). So you might be applying lots of nitrogen.... in situations where you have a molybdenum deficiency.... then just washing away your nitrogen into local rivers, lakes and streams.************* this will cause health problems in aquatic life ******************* Molybdenum is present in the lithosphere at average levels up to 2·3 mg kg−1 but can increase in concentration (300 mg kg−1) in shales that contain significant organic matter. The sources of high-molybdenum soils are Carboniferous black shales and limestones. Don't worry so much about the numbers - it's enough to know that Carboniferous black shales may contain 150 times more Mo than average (in the lithosphere). Molybdenum was the most abundant trace element present in the soluble and insoluble extractions of the wood-ash. ** also see banana peel compost which are high in molybdenum (Mo). *** Take away -- nitrogen is usually not the problem when you see symptoms of nitrogen deficiency -- it is more likely a Molybdenum deficiency.

- Celeste Archer

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