The Official Cannabis Independent strain guides
Rainbow Runtz No 58 Shop
The Official Cannabis collection · sheet 58No 58 · Rainbow Runtzvs Watermelon Z

Comparison

Rainbow Runtz vs Watermelon Z

Watermelon Z, which Leafly says is also known under an infringing candy name, is a cross of The Original Z (Zkittlez) and Watermelon; Zkittlez is also in the original Rainbow Runtz account and in Runtz.1,2,3,4 Both have small lab samples: 18.60% median THC for Watermelon Z (63 tests) against 21.73% for Rainbow Runtz (77).5

Side by side

Rainbow RuntzWatermelon Z
TypeHybrid; Leafly files it under indica, AllBud lists 50/506,7Indica-dominant hybrid1
LineageDisputed: Zkittlez × Do-Si-Dos, or Runtz × RS11 (Wizard Trees), among other crosses3,6The Original Z × Watermelon1
Median THC (state lab tests)21.73% (77 tests); small sample18.60% (63 tests); small sample
Middle half of THC results17.89%–25.33%15.27%–22.59%
Top terpenes (median)Too few tests report individual terpenes (4 of 77)β-Caryophyllene, Limonene, Linalool (22 tests)
Leafly’s top effectsRelaxed, sleepy, hungry6Sleepy, relaxed, giggly1
Flavor (Leafly)Pear, rose, flowery6Tropical, tree fruit, sweet1
Leafly THC listing25%624%1

Lab rows come from the same state lab dataset and matching rules for both strains.5

Lab-tested THC: Rainbow Runtz vs Watermelon Z

16% 20% 24% Rainbow Runtz Rainbow Runtz: median 21.73%, middle half 17.89%–25.33%, 77 tests 21.7% n=77 Watermelon Z Watermelon Z: median 18.60%, middle half 15.27%–22.59%, 63 tests 18.6% n=63 Median total THC (dot) and middle half of tests (bar)
Median and middle half of total THC in state lab tests. Small sample: Rainbow Runtz has only 77 tests; Watermelon Z has only 63 tests.5

The Z connection

Leafly’s page for Zkittlez now carries the name The Original Z: an alleged Grape Ape × Grapefruit cross that took 1st place at the 2016 Emerald Cup, renamed in 2023 as part of a settlement with a candy company.2 Watermelon Z has its own guide in the Official Cannabis network at watermelonz.com.

Which is easier to find

On Oct 4, 2026, 95 stores within 50 miles of Los Angeles listed Rainbow Runtz flower on Weedmaps, against 104 stores for Watermelon Z; around New York the counts were 27 and 16.8

More comparisons

Sources

  1. Leafly, Watermelon Z strain information. Accessed Oct 4, 2026.
  2. Leafly, The Original Z (aka Z) strain information. Accessed Oct 4, 2026.
  3. Weedmaps, Rainbow Runtz (aka Rainbow RZ) strain page. Accessed Oct 4, 2026.
  4. Leafly, Runtz (aka Runtz OG, Gelato Zkittlez) strain information. Accessed Oct 4, 2026.
  5. Cannlytics (CC BY 4.0), cannabis_results: public state lab results (filtered and aggregated by Official Cannabis). Accessed Oct 4, 2026.
  6. Leafly, Rainbow Runtz (aka Rainbow Runts) strain information. Accessed Oct 4, 2026.
  7. AllBud, Rainbow Runtz marijuana strain information and reviews. Accessed Oct 4, 2026.
  8. Weedmaps listings, compiled by Official Cannabis, Weedmaps flower menu snapshot, 27 US markets, Oct 4, 2026. Accessed Oct 4, 2026. Latest capture Oct 4, 2026.