Growing peppers at high latitudes

Here in the Seattle area we are, as you say, latitudelly challenged. We are fortunately to have the Pacific Ocean to give us mild winters and summers though our distance from the equator provides our plants with less intense light and a relatively short growing season for summer crops. One in particular difficult summer crop are peppers.

This is important because one of the major exports of my garden are the ingredients to allow me to make homemade garden salsa (tomatoes, garlic, onions, cilantro, jalapeño peppers) Al ingredients come from my garden (except for jalapeño peppers) This year I am determined to fix this.

I have a couple strategies for doing this, the first is to “start early” pepper plants require 80-110 days from seedling to harvest, timing is everything. Given our late winters here over the past couple years, I don’t really have much of a cushion here and would also be nice if the peppers were ripe when the tomatoes are getting red as well. To get a head start many weeks ago I planted several jalapeño pepper seeds and they currently are turning into some great looking pepper plants in my grow box. As they have grown I have potted them up to encourage them to continue to grow vigorously.

Not wanting to put my eggs peppers in one basket, I have decided to try a few different techniques in case one completely fails I hopefully have a couple backups:

  1. Grow pepper plant in grow box in WonderSoil
  2. Grow pepper plant hydroponically using a Grodan Gro-Blocks
  3. Grow pepper plant in the ground beside my tomatoes
  4. Grow pepper plant in large pot in sunniest location

I honestly can not really predict the outcome of this experiment. The grow box as the advantage of accurate temperature control but the CFLs though work great can’t compare to full sun. On the other hand outdoors has the great light intensity of the actual sun though given the pepper plants can stop growing lacking 60 degree nights and at least 70 degrees during day. Given we don’t have too many nights greater than 60 degrees the grow box might have a chance.

UPDATE — 05/25/2009

Plant grown in WonderSoil in grow box at temperature controlled to remain above 60 degrees at night and a high of 80 during the day.  This is amazing results compared to the 2.5 inch plants I started with less than a month ago.


Plant grown hydroponically using a Grodan Gro-Blocks also in temperature controlled grow box.


Plant grow in actual dirt outside in good light


Plant grown in pot outside…well this one is already out after some high winds and cold mornings this one was looking pretty bad to I brought to the infirmary (the grow box) to bring it back to life, which seems to have done wonders.


The obvious winner at this point is the pepper plant in WonderSoil in the grow box, though I have noticed some recent growth in the outdoor plant now the weather has started warming up, so might be some time for Mother Nature to redeem itself.  Overall I have been very impressed with the results of the grow box but still need to see if I can get flowers and fruit…until the next update…

UPDATE — 06/20/2009

We were blessed with some warm weather so the outdoor potted plant has been doing great blossoming and almost a dozen of good sized peppers growing.


I have seen plenty of blossoms on the pepper plants in the grow box though I have not have and fruit set.  I have two theories what is causing this, first is we have hat some hot weather with the garage getting over 85 degrees even with best exhaust and airflow it was hard to keep the temperature from exceeding 90 degrees which causes the blossoms to drop.  The second reason is I have been attempting to hand pollinate the flowers with the absence of some nice bees to do the work for me.  I have been using a fine paintbrush without much luck.  Switching to having better airflow and using a Q-Tip to simulate a bees bottom.


The plant I had in the ground eventually got overtaken by a pumpkin plant which I removed and moved to the grow box given it had not shown any significant signs of growth since I transplanted it there.

Right now seems the best method is grow the pepper plant to about 18 inches and just let mother nature take care of things at that point.

8 Responses to “Growing peppers at high latitudes”

  1. Red Icculus Says:

    Peppers are the #1 thing that I grow inside and out. You sound really determined this year. I wish you the best of luck.You are using all of my favorite growing media. Wonder Soil is great. Rockwool is the oldest tried and true hydro method. What style of irrigation are you going to be using in hydro?

  2. Cinj Says:

    Good thinking. If it’s a new technique to you it’s always nice to have a plan B (and c, d,…). Even if it’s not so new, it’s good insurance.

  3. keewee Says:

    I grew two plants last year and got about six teeny weeny peppers.I’m not giving up either, I am trying again this year.

  4. Ragnar Says:

    I saw a Chilli/Jalapenos grow under 30W (veg) and 45W (fruiting) High Power LEDs in a german forum. He used just white CREE Leds, quite similar to my setup with 16 of them. Vegging of any plant was very nice so far, I never did any flowers/fruits, just propagation for plants to go outside later. down a grow with a more powerful red/blue light in comparison, and it lost against the weaker while light.

  5. Daphne Says:

    I grow them every year and never get a great harvest, but one must have jalapenos so I keep growing them.

  6. The Cheap Vegetable Gardener Says:

    Fortunately we don’t like our salsa too spicy so shouldn’t need too many so even a couple of smaller ones probably will do. If all works well in the grow box may be growing them to warm up during the winter.Ragner, I already have my cheap LED supplemental light in there. Probably will move the top from my LED grow box as well now my seedlings are done. Not as much intensity as the high power LEDs but guess it can’t hurt 🙂

  7. Patti Says:

    That is such a great picture – she’s adorable! :)My aphids all left when my honeysuckle did. It was a disgusting magnet! Ladybugs didn’t even help.

  8. Robj98168 Says:

    I am bound and determined that I will grow watermelons in my back yard! I started some from seed this year. Never give up never surrender. I am also detemined to grow a head of broccoli this year.

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