Getting lisianthus spacing right is one of the most important decisions a cut flower farmer makes. Too tight and you get disease pressure, poor air circulation, and weak stems. Too wide and you're leaving money on the table. This guide gives you exact plant counts for 25-foot, 50-foot, and 200-foot rows, plus variety-specific spacing recommendations so you can plan your field with precision.
How Lisianthus Spacing Works: The Basics
Lisianthus for cut flower production is almost always grown with support netting in double or triple rows within a bed. The two numbers that matter are:
- In-row spacing: the distance between plants along the row
- Between-row spacing: the distance between rows within a bed
Standard commercial bed width is 36 to 48 inches with two or three rows per bed. Row spacing within the bed is typically 9 to 12 inches, with in-row plant spacing ranging from 6 to 18 inches depending on variety and production system.
Plant Counts for a 25-Foot Row
Use this table to calculate how many plants you need for a single 25-foot row at different in-row spacings:
| In-Row Spacing | Plants Per 25-Foot Row | Best Variety Type |
|---|---|---|
| 6 inches | 50 plants | High-density greenhouse, plug production |
| 9 inches | 33 plants | Greenhouse beds, tight commercial spacing |
| 12 inches | 25 plants | Standard field production, single stem |
| 15 inches | 20 plants | Branching varieties, moderate density |
| 18 inches | 16 plants | Open field, maximum stem quality |
Plant Counts for a 50-Foot Row
| In-Row Spacing | Plants Per 50-Foot Row | Best Variety Type |
|---|---|---|
| 6 inches | 100 plants | High-density greenhouse |
| 9 inches | 66 plants | Greenhouse beds |
| 12 inches | 50 plants | Standard field production |
| 15 inches | 40 plants | Branching varieties |
| 18 inches | 33 plants | Open field, premium stem quality |
Plant Counts for a 200-Foot Row
| In-Row Spacing | Plants Per 200-Foot Row | Seeds Needed (at 80% germination + 10% plug loss) |
|---|---|---|
| 6 inches | 400 plants | ~556 pelleted seeds |
| 9 inches | 266 plants | ~370 pelleted seeds |
| 12 inches | 200 plants | ~278 pelleted seeds |
| 15 inches | 160 plants | ~222 pelleted seeds |
| 18 inches | 133 plants | ~185 pelleted seeds |
Always order 20–25% more seed than your calculated need to account for germination variability.
Variety-Specific Spacing Recommendations
Not all lisianthus varieties perform the same at the same spacing. Here's how to match your variety to the right spacing for maximum stem quality and yield:
Super Magic Series — 9 to 12 Inch In-Row Spacing
The Super Magic series produces strong, upright stems with excellent branching. These varieties perform well at tighter commercial spacing and are the workhorse of most cut flower operations.
- Recommended spacing: 9–12 inches in-row, 12 inches between rows in a 48-inch bed (4 rows per bed)
- Support netting: required at 12 inches and 24 inches height
- Why tighter works: the upright growth habit means plants don't compete laterally as aggressively as branching types
Top Super Magic varieties for cut flower production:
- Super Magic Deep Blue Lisianthus Seeds — 1,000 Pelleted
- Super Magic White Lisianthus Seeds — 1,000 Pelleted
- Super Magic Rose Lisianthus Seeds — 1,000 Pelleted
- Super Magic Champagne Lisianthus Seeds — 1,000 Pelleted
- Super Magic Apricot Lisianthus Seeds — 1,000 Pelleted
- Super Magic Yellow Lisianthus Seeds — 1,000 Pelleted
- Super Magic Capri Blue Picotee Lisianthus Seeds — 1,000 Pelleted
Sabrina Series — 12 to 15 Inch In-Row Spacing
The Sabrina series produces larger, more open blooms with a slightly more branching habit than Super Magic. Give these a little more room to develop full, marketable stems.
- Recommended spacing: 12–15 inches in-row, 12–15 inches between rows (3 rows per 48-inch bed)
- Support netting: required at 12 and 24 inches; consider a third layer at 36 inches for tall stem production
- Why wider works: better air circulation reduces botrytis risk on the larger, denser blooms
Blue Chateau — 15 to 18 Inch In-Row Spacing
Blue Chateau is a premium specialty variety grown for high-end florists and specialty wholesale. It produces exceptional stem length and bloom quality — but it needs room to perform at its best.
- Recommended spacing: 15–18 inches in-row, 15 inches between rows (2–3 rows per 48-inch bed)
- Support netting: critical — Blue Chateau produces tall stems that will lodge without proper support
- Why wider works: maximum stem length and bloom size require reduced competition; this is a quality-over-quantity variety
How to Calculate Plants for Your Entire Field
Use this simple formula for any row length:
Plants per row = Row length (inches) ÷ In-row spacing (inches)
Then multiply by your number of rows:
Total plants = Plants per row × Number of rows
Example: You have 10 rows of 200 feet using Super Magic at 12-inch spacing:
200 ft × 12 inches = 2,400 inches ÷ 12 = 200 plants per row × 10 rows = 2,000 total transplants
Seed needed at 80% germination + 10% plug loss: ~2,778 pelleted seeds
Bed Layout: How Many Rows Per Bed?
| Bed Width | Row Spacing | Rows Per Bed | Best For |
|---|---|---|---|
| 36 inches | 12 inches | 3 rows | Super Magic, standard field |
| 48 inches | 12 inches | 4 rows | Super Magic, high-density |
| 48 inches | 15 inches | 3 rows | Sabrina series |
| 48 inches | 18 inches | 2–3 rows | Blue Chateau, premium production |
Key Spacing Rules Every Lisianthus Grower Should Follow
- Never skip support netting — lisianthus stems will lodge and become unmarketable without it, regardless of spacing
- Wider spacing = better air circulation — critical for preventing botrytis and fusarium in humid climates
- Tighter spacing = more stems per bed — but only if your variety's growth habit supports it
- Match spacing to your market — if you're selling single long stems to florists, go wider; if you're selling bunches at farmers markets, tighter spacing with more stems per plant works fine
- Always use pelleted seed — raw lisianthus seed is too fine to handle accurately at any commercial scale
For germination protocols and plug production timing, see our guide: How to Start Lisianthus Seeds Successfully.
Need smaller quantities to trial a new variety before committing to full rows? Visit www.trailingpetunia.com for retail and small-pack options.
Frequently Asked Questions
How far apart should lisianthus be planted for cut flower production?
Most commercial cut flower growers plant lisianthus at 9–12 inches in-row for upright varieties like Super Magic, and 12–18 inches for larger branching varieties like Sabrina and Blue Chateau.
How many lisianthus plants fit in a 25-foot row?
At 12-inch spacing, a 25-foot row holds 25 plants. At 9-inch spacing it holds 33 plants, and at 6-inch spacing it holds 50 plants.
How many lisianthus plants fit in a 50-foot row?
At 12-inch spacing, a 50-foot row holds 50 plants. At 9-inch spacing it holds 66 plants, and at 18-inch spacing it holds 33 plants.
How many lisianthus plants fit in a 200-foot row?
At 12-inch spacing, a 200-foot row holds 200 plants. At 9-inch spacing it holds 266 plants, and at 18-inch spacing it holds 133 plants.
Does lisianthus spacing affect stem quality?
Yes — wider spacing generally produces longer, stronger stems with larger blooms. Tighter spacing increases stem count per bed but can reduce individual stem quality and increase disease pressure if air circulation is poor.
How many rows of lisianthus fit in a 48-inch bed?
At 12-inch row spacing, a 48-inch bed holds 4 rows. At 15-inch spacing it holds 3 rows, and at 18-inch spacing it holds 2–3 rows depending on bed edge allowance.
Do different lisianthus varieties need different spacing?
Yes. Upright varieties like Super Magic perform well at 9–12 inches. Larger-bloomed varieties like Sabrina need 12–15 inches. Premium tall varieties like Blue Chateau perform best at 15–18 inches for maximum stem length and bloom quality.
How much lisianthus seed do I need for a 200-foot row?
At 12-inch spacing you need 200 transplants, which requires approximately 278 pelleted seeds accounting for 80% germination and 10% plug attrition. Always order 20–25% extra as a buffer.