Variety field guide
What to expect from Cal Sweet Watermelon Seeds
Cal Sweet Watermelon seeds produce red watermelon, 25 pounds, on vining/climbing plants.
Read the complete product descriptionTraits, flavor, garden use, variety notes, and the full catalog record
Cal Sweet Watermelon seeds produce red watermelon, 25 pounds, on vining/climbing plants. It is best suited to productive warm-season beds, trellises or sprawling vines, kitchen use, and seed saving. Introducing the 'Cal Sweet' watermelon, a quintessential summer delight known for its vigorous growth and luscious, sweet flavor. Cal Sweet Watermelon Seeds produce classic picnic watermelon with crisp, red flesh and deliciously balanced sweetness.
About Cal Sweet
Cal Sweet is an annual watermelon with red color, 97–120 in mature height or spread, and a vining/climbing habit. Harvest form or size: 25 pounds. Botanically it is Citrullus lanatus (Thunb.) Matsum. & Nakai. Maturity or first bloom: 80-89 Days; germination: 5-10 Days at 75–90 °F. Best for productive warm-season beds, trellises or sprawling vines, kitchen use, and seed saving. Introducing the 'Cal Sweet' watermelon, a quintessential summer delight known for its vigorous growth and luscious, sweet flavor.
History and provenance
Cal Sweet circulates as a named watermelon within the cultivated history of Citrullus lanatus (Thunb.) Matsum. & Nakai. Seed sold as Cal Sweet is identified by its red color, growth form, harvest use, and the documented harvest traits. A complete breeder record, introduction year, family story, or uninterrupted custody chain has not been located for this seed lot. The cultivar identity is tied to observable crop traits that can be checked in a grow-out, not to an unsupported origin story. Its thick, green rind is beautifully adorned with dark stripes, encasing the juicy, red flesh that is both refreshing and incredibly sweet. As the summer sun intensifies, 'Cal Sweet' watermelons develop their signature sweetness, making them an ideal choice for fresh consumption. Slice them up for a juicy snack or incorporate them into fruit salads for a burst of natural sweetness. The firm texture of the flesh also makes it suitable for grilling or adding to savory dishes, offering a delightful contrast to more robust flavors. The present seed is sold under the name Cal Sweet, but a complete public breeder or release record has not been located. Keep the original supplier and lot information with any saved seed.
Growing facts
| Scientific name | Citrullus lanatus (Thunb.) Matsum. & Nakai |
|---|---|
| Life cycle | Annual |
| Maturity / first bloom | 80-89 Days |
| Germination | 5-10 Days at 75–90 °F |
| Seed depth | 1 in |
| Plant height / spread | 97–120 in |
| Growth habit | Vining/Climbing |
| Spacing | 36 in between plants; 48 in between rows |
| Sunlight | Full sun |
| Soil | Loamy; pH 6.0–6.5 |
| Water | Moderate |
| Support | No-Support |
Starting Cal Sweet from seed
How to grow Cal Sweet Watermelon
Botanical identity: Citrullus lanatus (Thunb.) Matsum. & Nakai. Life cycle: Annual.
Sow 1 in and use a seed-zone temperature near 75–90 °F. Expected emergence: 5-10 Days. No stratification; direct sow into warm soil or start briefly in biodegradable cells and transplant young
Plant during Late Spring. Space plants 36 in apart with 48 in between rows or planting bands.
Provide Full sun, moderate water, and loamy near pH 6.0–6.5. Support: No-Support.
Garden performance and care
Give Cal Sweet enough room for its vining/climbing growth. Direct irrigation to the soil, keep developing fruit on dry mulch or boards where rot is common, and leave seed-saving fruit on the plant beyond the eating stage. Expected emergence is 5-10 Days; the listed maturity or bloom timing is 80-89 Days.
Harvest, bloom, and uses
Cal Sweet is best for productive warm-season beds, trellises or sprawling vines, kitchen use, and seed saving. Harvest form or size: 25 pounds. Color at the principal harvest or mature stage: Red. Introducing the 'Cal Sweet' watermelon, a quintessential summer delight known for its vigorous growth and luscious, sweet flavor.
Saving seed
Seed saving for Cal Sweet Select several healthy, true-to-type plants so the saved lot represents the variety rather than one unusually early or large individual. Melons are insect-pollinated and varieties of the same species can cross. Isolate compatible varieties or use controlled pollination, and mark fruit from healthy true-to-type plants. Allow seed fruit to become fully ripe; eating ripeness and seed maturity should both be reached. Remove seed, separate pulp by washing or short fermentation as appropriate, rinse until clean, and dry in a thin layer with good airflow. Keep records of species, variety, plant count, isolation, ripeness test, fruit traits, and year.
Common problems
Watch Cal Sweet for cucumber beetles, squash bugs where applicable, aphids, powdery or downy mildew, bacterial wilt, crown rot, poor pollination, and fruit damage on wet soil. Rotate cucurbit crops, provide airflow, water at the root zone, protect young plants before flowering, and remove covers when blossoms need pollinators. Do not work wet vines.
Frequently asked questions
When is Cal Sweet ready?
80-89 Days from warm direct sowing or equivalent established transplant
How long does germination take?
Expect 5-10 Days near 75–90 °F; actual emergence changes with moisture, seed condition, and soil temperature.
How large does it grow?
About 97–120 in with a vining/climbing habit. Support: No-Support.
Can it grow in a container?
Best in open ground or a large raised bed; mature vines require substantial horizontal or vertical space.
How is it used?
Primary uses: productive warm-season beds, trellises or sprawling vines, kitchen use, and seed saving. Introducing the 'Cal Sweet' watermelon, a quintessential summer delight known for its vigorous growth and luscious, sweet flavor.
Can I save seed?
Yes where the crop biology allows, but keep compatible varieties isolated, use several healthy plants, wait for full seed maturity, dry thoroughly, and label the lot.
Minimum Seed Count:30 seeds
