Arjan's Ultra Haze (Greenhouse Seed Co) vs Arjans Haze #2 (Greenhouse Seed Co) cannabis seeds comparison

Arjan's Ultra Haze vs Arjans Haze #2: Which Feminized Sativa Is Right for You?

1. Introduction

Arjan's Ultra Haze and Arjans Haze #2 are both feminized sativa strains from Greenhouse Seed Co, aimed at growers who enjoy classic Haze-style plants. While they share a breeder and a broadly similar sativa profile, they differ in flowering time, genetics, and how suitable they are for less experienced growers.

This comparison focuses on how these two options stack up for first-time growers, buyers looking for strong effects, and growers who care about flowering time and potential yields. By the end, you should have a clearer idea of whether Arjan's Ultra Haze or Arjans Haze #2 is the better fit for your next grow.

2. Quick Comparison Table

Feature	Arjan's Ultra Haze	Arjans Haze #2
Breeder	Greenhouse Seed Co	Greenhouse Seed Co
Seed type	Feminized	Feminized
Type	Sativa	Sativa
Genetics	Neville's Haze × Cambodian × Lao	Haze × Lao
Flowering time	12 weeks	10 weeks
THC	Strong	Not specified

3. Arjan's Ultra Haze Overview

Arjan's Ultra Haze is a feminized, predominantly sativa strain from Greenhouse Seed Co. It combines Neville's Haze with Cambodian and Lao genetics, bringing together several classic landrace influences into a single hybrid. The result is a plant that stays firmly on the sativa side in both structure and overall character.

One of the defining traits of Arjan's Ultra Haze is its long flowering period of around 12 weeks. This extended bloom time is typical of many Haze-heavy genetics and is worth keeping in mind if you are working with limited time or space. Growers interested in this strain should be prepared for a longer run and a bit more patience before harvest.

The THC level is described as strong, making Arjan's Ultra Haze especially appealing to users looking for a more powerful experience. While specific effects are not detailed, its strong THC and pure sativa background suggest that it is aimed at those who already have some familiarity with potent varieties and who actively seek intensity rather than subtlety.

Because of its genetic background and extended flowering window, Arjan's Ultra Haze is generally better suited to growers who are comfortable managing taller, more vigorous sativas and who can maintain a stable environment over several months. It can be a rewarding choice for those willing to commit the time and care required to see it through to full maturity.

4. Arjans Haze #2 Overview

Arjans Haze #2 is another feminized sativa from Greenhouse Seed Co, built from Haze and Lao genetics. Compared with Arjan's Ultra Haze, its genetic makeup is slightly simpler, pairing Haze with Lao lines, which still keeps it in the classic Haze family while offering a somewhat more streamlined background.

A key practical difference is its shorter flowering time of about 10 weeks. For a Haze-influenced sativa, this is relatively manageable and may make Arjans Haze #2 more accessible for growers who cannot commit to very long cycles. Shaving two weeks off flowering can be significant if you have tight scheduling, shared grow spaces, or are just getting started and want to see results sooner.

The breed description does not specify THC potency for Arjans Haze #2. It is still a Haze-based sativa, so it is reasonable to expect a clearly noticeable effect profile, but since no concrete potency figure or descriptor is provided, it is best viewed as a more neutral option on paper when comparing purely by strength.

With its feminized seeds, sativa nature, and slightly quicker finish, Arjans Haze #2 can be a practical choice for growers who like the idea of Haze genetics but prefer a schedule that is a little easier to accommodate. It may also be more forgiving for those running their first Haze-style grow, simply because the plants do not need to remain in flower as long.

5. Key Differences

General comparison

Both strains are sativa feminized seeds from the same breeder, but they diverge in genetics, flowering time, and stated potency:

Genetics: Arjan's Ultra Haze combines Neville's Haze with Cambodian and Lao lines, layering multiple influences. Arjans Haze #2 uses a combination of Haze and Lao genetics, which is slightly simpler.
Flowering length: Arjan's Ultra Haze requires about 12 weeks in flower, while Arjans Haze #2 finishes in roughly 10 weeks.
Potency description: Arjan's Ultra Haze is described as having strong THC. Arjans Haze #2 does not have a specified THC descriptor in the available data.

In practical terms, Arjan's Ultra Haze leans towards being a more intensive, longer-term project with clearly strong potency, whereas Arjans Haze #2 offers a slightly quicker turnaround and a more neutral profile on paper in terms of strength.

Which is better for beginners?

For a first-time grower or someone just starting with sativas, the main concern is usually how long the grow will take and how easy it is to manage the plants from start to finish.

Arjan's Ultra Haze and its 12-week flowering period demand more patience and consistent care. The strong THC also means the final product may be more intense than some beginners expect.
Arjans Haze #2 has the advantage of a 10-week flowering time, which can feel much more manageable if you are learning the basics of feeding, training, and environmental control.

While both are sativa strains and can require attention to height and structure, the shorter flowering window of Arjans Haze #2 makes it the more beginner-friendly option overall. It allows new growers to complete a full cycle more quickly and gain experience without committing as much time as Arjan's Ultra Haze requires.

Yield comparison

Specific yield figures are not provided for either Arjan's Ultra Haze or Arjans Haze #2, so it is not possible to give a direct numerical comparison. However, some general observations can still help frame expectations:

Longer-flowering sativas like Arjan's Ultra Haze sometimes offer the potential for good production when grown well, simply because they spend more time in bloom. But this depends heavily on grower skill, environment, and plant training.
The slightly shorter flowering time of Arjans Haze #2 may reduce total output compared with very long-flowering sativas in some setups, but it can increase annual turnover since you can fit more cycles into the same time period.

If your main goal is maximum yield per year rather than per plant, the faster-finishing Arjans Haze #2 can be advantageous, as more harvests can be completed. If you are comfortable with a longer cycle and want to focus on getting the most from individual plants, Arjan's Ultra Haze might appeal, though the actual yields will still depend on how well you manage the grow.

Effects comparison

While detailed effect profiles are not provided, there are still some clear points of comparison:

Arjan's Ultra Haze is explicitly described as having strong THC. This suggests it is geared towards users actively seeking more powerful effects and who already have some tolerance or experience with high-THC sativas.
Arjans Haze #2 does not include a THC description in the available information, so it is best treated as an option where the exact potency is not specified on paper.

For a user specifically looking for strong effects, the information leans in favour of Arjan's Ultra Haze, as it is clearly positioned as a high-THC strain. For those who prefer to start with something less explicitly strong, or who are uncertain about their tolerance, Arjans Haze #2 may be the safer first choice simply because its potency is not highlighted in the same way.

6. Which Should You Choose?

The right choice depends on your priorities: ease of cultivation, time constraints, and how strong you want the effects to be.

Choose Arjan's Ultra Haze if:
- You want a sativa with clearly strong THC and are comfortable with a more intense experience.
- You do not mind a 12-week flowering period and can provide a stable environment over a longer grow.
- You are interested in complex genetics, including Neville's Haze, Cambodian, and Lao influences.
- You already have some growing experience or are willing to take on a more involved project.
Choose Arjans Haze #2 if:
- You are a beginner or newer grower who wants a Haze-style sativa that finishes a bit faster.
- A 10-week flowering time fits better with your schedule or space.
- You prefer a feminized sativa where potency is not specifically emphasised as “strong” in the description.
- You want to run more cycles per year and value quicker turnaround.

If you are a first-time grower deciding between these two, Arjans Haze #2 is generally the more practical starting point. If you are already comfortable with sativa growth patterns and are seeking stronger effects, Arjan's Ultra Haze is more likely to match your expectations.

7. Final Thoughts

Arjan's Ultra Haze and Arjans Haze #2 sit in the same family of feminized sativas from Greenhouse Seed Co, yet they serve slightly different needs. Arjan's Ultra Haze caters to those who prioritise strong THC and are prepared to invest time into a 12-week flowering period. Arjans Haze #2 trims that timeline to around 10 weeks, offering a more accessible option for beginners and growers focused on quicker results.

By weighing your experience level, your capacity for longer flowering cycles, and how strong you want the final product to be, you can choose the strain that best matches your goals—whether that means the high-intensity appeal of Arjan's Ultra Haze or the more time-efficient approach of Arjans Haze #2.