Quick answer
Runtz is a hybrid strain. It is a cross of Zkittlez and Gelato #33. Lab tests on flower run 19% to 29% THC and under 1% CBD. The high starts with euphoria and eases into body relaxation. Indoor flowering takes 8 to 9 weeks. Leafly named Runtz its Strain of the Year for 2020.
Genetics and lineage
Zkittlez carries Grape Ape and Grapefruit in its line. Gelato #33 carries Sunset Sherbet and Thin Mint Girl Scout Cookies. The cross appeared around 2017. Most accounts credit breeder Ray B. and the Cookies brand with the release. Reports differ on the exact year.
Both parents lean slightly indica, so Runtz sits near a 50/50 split. Plants grow bushy at medium height with dense buds.
THC, CBD, and lab numbers
Most published certificates of analysis list 19% to 29% THC. Top batches land near the high end. CBD reads at or below 1%. Total terpenes land near 1% to 2% in fresh, cured flower.
Numbers move with the grower. Light, nutrients, harvest timing, and cure all shift the result. The same cut from two cultivators can test 4 to 6 points apart.
Terpenes and aroma
- Beta-caryophyllene: pepper and spice, the most common terpene in the profile.
- Limonene: citrus peel and sweetness.
- Linalool: floral note.
- Alpha-humulene: earthy, hoppy.
The smell is sweet and fruity, close to candy and tropical fruit. The exhale carries a light fuel note from the Gelato side.
Effects
Users report euphoria in the first 10 to 15 minutes. Mood lift comes with a relaxed body feel. Some people stay talkative and creative. Others slow down and sit. High doses push toward sedation and couch-lock.
Smoked or vaped effects last about 2 to 3 hours. Edible effects last 4 to 8 hours and hit harder.
Side effects and risks
Dry mouth and dry eyes are the most reported issues. Some users report dizziness, headache, or anxiety at high doses. THC raises heart rate and can worsen paranoia in people prone to it. New users should start with 2 to 3 mg of THC and wait two hours before more.
Growing Runtz
Runtz grows from photoperiod seed or clone. Indoor flowering runs 8 to 9 weeks. Outdoor plants finish in mid to late October in the northern hemisphere. Breeders list indoor yields near 450 to 550 grams per square meter.
Prune lower growth for airflow. Keep late-flower humidity at 40% to 50%. Bud rot risk rises in wet climates. The strain responds well to low-stress training and a trellis.
Runtz crosses and look-alikes
White Runtz, Pink Runtz, Runtz OG, and Gelato Runtz are separate releases with different parent lines. Strain names are not regulated in the US. Two jars with the same label can hold different genetics.
Check three things before buying: the cultivator name, the harvest date, and the certificate of analysis. Ask for the THC total and the top three terpenes.
Legal status
Cannabis is Schedule I under federal US law. State rules vary. Buy from licensed dispensaries in states with medical or adult-use programs.