Size Matters Side Challenge

SAFC 2023 banner

Big or Small, Size Matters! In this side challenge, there are two ways to win: go big or stay small! Start your Autos on 4/20, and at the end of June, we will collect submissions for the Size Matters Side Challenge!


Mars Hydro is our Prize Sponsor!

  • The Biggest Auto Flower Plant will win a new Mars Hydro FC-4800!
  • The Smallest Auto Flower Plant will win a new Mars Hydro FC-E3000!

The Mars Hydro FC-4800 is an LED bar-array fixture designed for 4’ x 4’ coverage. It uses top-quality components and Samsung LM301B diodes. The FC-4800’s design and diode distribution allow it to spread high-density light evenly across the canopy, providing optimum lighting for all stages of plant growth.

Check out Dr Coco’s test report of the similar Mars Hydro FC-E4800 for more information.

The Mars Hydro FC-E3000 is an adjustable LED bar grow light designed for 3’ x 3’ coverage. It uses more than 1100 Bridgelux diodes to deliver light uniformly across the canopy. The FC-E3000 is also incredibly efficient. Because of its price and performance, the Mars Hydro FC-E3000 is among Dr Coco’s top picks for 3’ x 3’ grow lights.

Read Dr Coco’s full FC-E3000 test report for more information on this fixture.

If you need lights or growing equipment, Check out the deals on great gear at and use discount code CCFC!

Joining the Size Matters Side Challenge

Rules & Restrictions

  • You must Grow Auto flowers.
  • You must get your seeds wet on 4/20/2023.
  • You must start your SAFC journal by April 30th.
  • You must make at least one update which documents the progress of your plant(s) during each calendar month during the SAFC (April, May, June, and July).
  • Everything else is up to you! You can use any type of media, containers, lights, seeds, nutrients, training, indoor/outdoor, etc.

Submission Process

  • In mid-June, we will start two threads in the SAFC Forum: one for the Biggest Auto Flower and one for the Smallest Auto Flower.
  • Participants must make a submission to the relevant thread to be considered.
    • Submissions will include photo(s) and a brief written description.
    • The deadline for submissions will be July 1st.
    • You can submit only 1 plant per thread/category.

Selecting the Winners

The winners will be determined using a two-phase selection process:

Phase 1: The challenge leaders will nominate five plants from each category. All nominated plants will be posted on this page for public viewing during Phase 2.

Phase 2: The CocoforCannabis Steering Committee will follow jury rules to select winners in each category. We will meet to deliberate and hold a series of private votes until consensus is achieved. During this process, we may request additional information about the plants from the growers.

The winners will be announced on a Live YouTube show during the second week of July.