When choosing between ferns deep or wide pots, go wide every time. Boston ferns prefer wide, low-profile containers because their roots spread outward through runners. They don't grow deep into the soil like many other plants. A wide pot gives those runners room to expand. A deep pot wastes space and traps excess water below the root zone.
Getting the boston fern pot size right made a huge difference for one of my plants. I had a fern stuck in a tall narrow pot for over a year and it barely grew. The roots had packed into a dense circle at the bottom with nowhere left to go. I moved it into a wide container that was 4 inches wider and the change shocked me. Within 6 weeks, the fern pushed out 9 new fronds and the old ones grew thicker and deeper green.
Boston fern roots stay near the surface and grow in a fibrous pattern. They spread through stolons, which are runners that move sideways along the top layer of soil. These stolons send up new fronds as they expand outward from the center. A deep pot forces extra soil below the roots where the fern can't reach it. That unused soil holds water and creates rot conditions. A wide, low pot matches the plant's natural growth habit and keeps all the soil in reach of the roots.
For sizing, pick a pot that is 2 inches (5 cm) wider than the current root ball but only 1 to 2 inches deeper. Always grab a container with at least one drainage hole in the bottom. If your fern sits in a standard 6-inch nursery pot, move up to an 8-inch wide pot that is 6 to 7 inches deep. This gives the roots room to spread for a full year before needing another upgrade.
Hanging Baskets
- Best for: Porches, bathrooms, and bright rooms where floor space is tight and you want fronds to hang down.
- Watering note: These dry out 50% faster than standard pots because air moves around all sides of the container.
- Size range: Start with a 10 to 12 inch basket for a mature fern and check soil moisture every other day.
Standard Wide Pots
- Best for: Tables, plant stands, and windowsill spots where the fern sits at eye level and you want controlled growth.
- Material tip: Terracotta breathes and prevents soggy soil while plastic holds moisture longer for forgetful waterers.
- Size range: Pick a pot 2 inches wider than the root ball with a saucer to protect your furniture from drips.
Self-Watering Containers
- Best for: People who travel or forget to water because the built-in reservoir keeps soil moist for days at a time.
- Caution: Check the water level weekly and empty the reservoir if soil gets too soggy to prevent root rot problems.
- Size range: These come in 8 to 14 inch widths and you should still choose wide over deep for proper root spread.
The best pot for boston fern depends on where you plan to put the plant and how often you tend to water. Hanging baskets work great on porches but need more watering. Standard pots on stands give you control over placement. Self-watering models save time if you travel. Pick the style that fits your routine and your fern will thrive.
You'll know it's time to increase your fern container size when roots poke through drainage holes or circle the bottom. Most Boston ferns need repotting every 12 to 18 months during their active growing years. Spring is the best time to repot because the plant bounces back fast. Stick with wide and low as your rule for every pot and your fern will push out more fronds with fewer rot problems.
Read the full article: Boston Fern Care and Growing Guide
