Ultra Lemon Haze

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Sativa-dominant Ultra Lemon Haze is the result of crossbreeding Lemon Haze (a former overall Cannabis Cup winner) and Sour Diesel. The resulting hybrid was then further crossed with Auto#1, which contains excellent Ruderalis genetics. The Ruderalis genetics mean that this is a short-growing autoflowering variety.

When you light up Ultra Lemon Haze weed, you’ll immediately notice the clean, citrus fruit aroma and then you’ll taste lemons and grapefruits combined with some sour tones that come from the Diesel parent. Expect a cerebral, buzzy hit that will leave you feeling engaged and active.

This plant only grows to a maximum height of 80 centimetres, and often tops out at as little as 60 or 70 centimetres. The bright green leaves have slender serrated fingers and the dense buds have a longish, conical shape and orange hairs. In medical use, this weed can help with sleep and appetite problems.

As an autoflowering type, Ultra Lemon Haze grows well indoors in a controlled environment, although you may need to vary its feeding between the vegetative and the blossoming stages. Flowering time is around eight to nine weeks. Increasing the flowering time should lead to a more potent crop and yields are in the medium range.

Ultra Lemon Haze seeds grow successfully outdoors but like all strains the more warm sunshine it gets, the better it will do.

Smokers who enjoy an energetic high and a citrus fruit flavored smoke will definitely appreciate Ultra Lemon Haze. It can be on the difficult side to cultivate successfully, so it’s probably not for novice growers.

Strain Characteristics:

Indoors or outdoors
Short - Autoflowering
THC Level:
Flowering Time:
8-9 weeks from seed
Plant Type:
Mid July, Late October
Lemon Haze x Sour Diesel x Auto #1
Grow Difficulty:
Moderate - Difficult


Ultra Lemon Haze, 3.9 out of 5 based on 54 ratings


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2 comments on Ultra Lemon Haze
  1. danny

    i am on week 3 veg under 20/4, should i change to 16/8 or 12/12 next week? i read in forums that this plant is not auto but breeder doesn’t confirm this yet

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    Rating: 0 (from 6 votes)
  2. Hempy

    This is an awesome variety!! The stats are a bit out though!
    The plant i grew last season topped 6 foot and gave me 15 oz of super hashy buds! And it was a 5 month grow.. It was dry and in a phatt joint by the end o january.. only ran out about two months ago!!
    In a joint it would become too oily to smoke by about half way through!! I made some BHO out of 30g o bud, just on six g in oil back!! Very happy!!
    Medicinally, i had zero pain,(i have multiple health issues), was motivated and happy, i also used this variety,(another plant grown at a different time), along with a pure indica(afghan) to cure a chronic illness i had suffered for about fifteen years with..
    And i also dunno about it not being for novice growers either.. I just dug a hole 3’x3’x3′, loosely packed some peastraw into it, backfilled it with the soil i took out mixed with chook poo, watered it in and mulched an area about 6′ round, put the plant in and watered it every couple days with rainwater out the tank.. Easy peasy.. Awesome variety.. really!! Only have one seed left, but i will be ordering more very soon!! Deffo worth it!!

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    Rating: +4 (from 6 votes)

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