Seed Treatment
Cold Stratification Steps:
- Mix seeds with moist sand, vermiculite, or a damp paper towel.
- Place the mixture in a sealed plastic bag.
- Refrigerate at 35–40°F (1–4°C) for 2–4 weeks.
- After stratification, sow seeds immediately indoors or directly in the garden.
When to Sow
- Indoors: Start seeds 6–8 weeks before the last frost.
- Outdoors: Sow in early spring after the last frost or in late fall for natural stratification.
Soil Requirements
- Prefers well-draining, sandy or gravelly soil.
- Tolerates poor and rocky soil conditions.
- Ideal pH: 6.0–7.5.
Light Requirements
- Thrives in full sun.
- Can tolerate light shade, but flowering may be reduced.
Sowing Depth
- Sow seeds ⅛ inch (3 mm) deep or lightly press onto the soil surface.
- Do not bury deeply, as light aids germination.
Watering
- Keep soil evenly moist but not soggy during germination.
- Once established, it is drought-tolerant and requires minimal watering.
Germination Time
- Germinates in 10–21 days at 65–70°F (18–21°C).
Spacing
- Thin or transplant seedlings to 12–18 inches (30–45 cm) apart.
Growing Tips
- Saponaria ocymoides forms a low-growing, trailing mat of pink flowers perfect for rock gardens, edging, retaining walls, and ground cover.
- Blooms in late spring to early summer.
- Cut back after flowering to maintain shape and encourage denser growth.
- Very hardy and tolerant of neglect once established. Deer resistant and attractive to pollinators.