Red Rubin basil (Ocimum basilicum var. purpurascens) isn’t just a feast for the eyes — it’s a nutritional powerhouse.
Its deep purple hue comes from anthocyanins, compounds known for their antioxidant properties. According to a study published in Food & Function (2019), this basil is loaded with rosmarinic acid, γ-tocopherol, and α-linolenic acid — all linked to inflammation reduction, microbial resistance, and overall wellness.
Curious how to grow red rubin basil at home and get the most from its color and benefits? Let’s dig in. 🌿
Ideal Conditions for Growing Red Rubin Basil
To thrive, Red Rubin basil requires full sun and well-draining soil.
You’ll want to provide at least 6–8 hours of sunlight daily — we break this down in more detail here.
For best results, read our soil preparation guide for basil.
Starting from Seeds vs. Cuttings
I’ve grown Red Rubin both ways — honestly, propagation from cuttings is faster if you have access to a healthy parent plant.
Need help with either? Check out our guides on growing basil from seeds and propagating basil via cuttings.
Step-by-Step Guide to Planting Red Rubin Basil
Prefer quick facts? You can learn the key steps for planting Red Rubin basil in the table below — or keep reading for the detailed guide just after.
| Step | What to Do | Why It Matters |
|---|---|---|
| #1 Location | Choose a sunny spot or pot (≥ 6 hours direct light, 6″ deep with drainage) | Supports anthocyanin-rich leaf color and prevents root rot |
| #2 Soil | Use well-draining soil (pH 6.0–6.5), compost or worm castings optional | Encourages healthy root growth and nutrient uptake |
| #3 Planting | Sow seeds 1/4″ deep or place cuttings with one node in soil | Ensures proper germination or rooting environment |
| #4 Watering | Mist soil daily; maintain 21–26°C (70–79°F) during germination | Keeps seeds moist and supports sprouting (7–14 days) |
- Pick a sunny spot or container with at least 6 hours of direct light. Use pots that are minimum 6 inches deep with good drainage to avoid root rot.
- Use well-draining, slightly acidic soil (pH 6.0–6.5), enriched with compost or worm castings. This supports healthy root development and anthocyanin production.
- Sow seeds 1/4 inch deep or plant cuttings with one node below the soil. Keep the soil temperature between 21–26°C (70–79°F) for optimal germination.
- Mist daily to keep soil moist but not soggy. Seeds sprout in 7–14 days; cuttings typically root in under a week.
For complete soil nutrient guidance, explore our nutrient guide.
Care & Maintenance – Watering, Feeding, and Pruning
This purple basil loves moist soil — but hates soggy roots.
If unsure, here’s how to spot overwatering vs. underwatering. For feeding, apply a balanced fertilizer every 3–4 weeks during active growth — details in our fertilization guide.
Regular pruning not only boosts leaf production but prevents bolting. Learn how to prune correctly in this step-by-step guide.
Common Pests and How to Prevent Them
Like other basil varieties, Red Rubin may attract aphids, Japanese beetles, and spider mites. We’ve written about common basil pests and their treatments.
Sunlight Requirements and Leaf Coloration in Red Rubin Basil
The deep purple pigmentation of Red Rubin basil is a result of high anthocyanin content — compounds that require adequate light to be fully expressed.
Insufficient light causes anthocyanin degradation, resulting in muted or green-tinted leaves.
To maintain optimal coloration:
- ✅ Provide at least 6–8 hours of direct sunlight daily. This ensures high anthocyanin synthesis and vibrant purple leaves.
- ✅ In indoor settings, use LED grow lights rated at 6000K–6500K for 12–14 hours per day, positioned 12–16 inches above the canopy.
Overwintering and Cold Sensitivity of Red Rubin Basil
As a warm-season annual, this basil with purple leaves cannot tolerate cold snaps or frost.
Once temperatures dip below 50°F (10°C), Ocimum basilicum var. purpurascens begins to show signs of stress:
- ⚠️ leaf curling,
- ⚠️ purple-black discoloration,
- ⚠️ and eventual dieback.
To preserve your plants through the colder months, you have two main options:
- Indoor Relocation: Carefully uproot the basil and transplant it into a pot with drainage. Place it on a south-facing windowsill or under a full-spectrum grow light for 12–14 hours daily.
- Pre-frost Harvest: If bringing indoors isn’t feasible, harvest all usable leaves before the first frost and preserve them using freezing or drying methods.
Harvesting and Storage Tips
You can start harvesting once the plant reaches 6–8 inches in height. Pinch off leaves regularly to encourage bushiness.
Want to preserve that vibrant purple color? Check out our guides on freezing basil and drying techniques.
Red Rubin Basil in Companion Planting
Red Rubin thrives alongside tomatoes, peppers, and oregano — it’s even known to repel certain insect pests! But keep it away from fennel.
Red Rubin’s strong clove-like aroma is believed to deter certain soft-bodied insects like aphids — but it’s not a standalone pest repellent.
For best protection, pair it with companion plants like marigolds or nasturtiums that also ward off pests.
For an in-depth look, see our companion planting guide.
FAQs About Growing Red Rubin Basil
Can Red Rubin Basil grow indoors?
Yes — it’s one of the better basil varieties for containers. You’ll need grow lights in winter. More in our guide on indoor basil cultivation.
Does it taste different than green basil?
Yes. Red Rubin has a slightly spicier, more clove-like flavor. Some even say it’s got a hint of licorice. Curious? Here’s why basil smells like licorice.
Can I grow it from supermarket basil?
Absolutely! Just check out our tutorial on repotting supermarket basil.
How tall does Red Rubin basil grow?
Red Rubin basil typically grows to a height of 18 to 24 inches (45–60 cm) when provided with full sunlight, regular pruning, and nutrient-rich soil.
How much does a Red Rubin basil plant yield?
A mature Red Rubin basil plant can yield approximately 100–150 grams (3.5–5 oz) of fresh leaves per season. With consistent harvesting and proper care, some growers report even higher yields in warm climates.
Is Red Rubin basil edible raw?
Yes, Red Rubin basil is edible raw. Its slightly spicy, clove-like flavor makes it a great addition to fresh salads, sandwiches, and pesto. (The purple color comes from natural anthocyanins, which are safe and commonly found in other raw vegetables like red cabbage or purple carrots.)
Bringing It All Together: Red Rubin Basil Care
Red Rubin basil isn’t just about looks. With the right setup — sunlight, balanced soil, and regular care — this purple herb gives you a bountiful, beautiful harvest.
And those health benefits? That’s just the icing on the (pesto) cake. If you’re new to growing basil, you might want to also visit our Ultimate Basil Guide to get the bigger picture.
Ready to turn your basil game from basic to Red Rubin brilliant? Let us know how your journey goes!
I'm George Brown, a passionate gardener and the founder of UrbanLeafy.com. I love helping beginners grow fresh herbs, plants and greenery, whether on a windowsill, in a garden or a tiny balcony. My practical, no-fluff tips have been featured in Homes & Gardens, Livingetc, and Best Life, and are rooted in years of real experience. If you're ready to turn your space into a thriving herb haven, you’re in the right place.
