Soil & potting mix
Best soil for Hosta 'Sum and Substance' (Hosta 'Sum and Substance')
Also called Sum and Substance Hosta, Giant Gold Hosta, Plantain Lily.
More about hosta 'sum and substance'
About Hosta 'Sum and Substance'
Hosta 'Sum and Substance' · also called Sum and Substance Hosta, Giant Gold Hosta · flowering
Hosta 'Sum and Substance' is one of the largest hosta cultivars, producing enormous chartreuse-to-golden leaves up to 60 cm across in a bold clump. Pale lavender flowers appear in summer. It tolerates more sun than most hostas. The entire genus Hosta is toxic to cats, dogs, and horses.
Preferred mix: Moist, humus-rich, well-drained loam
Watch for — Crown rot: Soft, malodorous crown from overwatering or poor drainage; improve drainage and avoid mulching directly against the crown.
Why hosta 'sum and substance' needs this mix
Hosta 'Sum and Substance' flowers hardest in a rich but free-draining loam — fed enough to fuel the display, open enough that the roots never waterlog.
- Flowering is expensive for hosta 'sum and substance': producing buds, blooms and seed draws heavily on nutrients and steady moisture, so the soil has to keep delivering all season.
- A loam-based mix holds nutrients and water far more evenly than a light peat mix, which means a longer, more reliable flowering period.
- It still needs sharp drainage — most flowering plants resent cold, wet feet far more than they resent being a little lean.
For the full picture on what makes up a good mix, see our guide to the main types of soil and potting media — it explains why each ingredient above behaves the way it does.
What goes wrong with the wrong mix
The wrong soil is one of the most common reasons hosta 'sum and substance' struggles, and the damage often shows up weeks later as a watering problem. For this species specifically:
- A thin, hungry or sandy mix gives hosta 'sum and substance' weak growth and few, short-lived flowers — it simply runs out of fuel.
- A heavy, badly drained soil rots the roots or crown, often over a wet winter, and you lose the plant before it ever flowers again.
- Over-rich, high-nitrogen mixes can push lush leaf at the expense of flowers — balance, not excess, is the aim.
Either starving hosta 'sum and substance' in a thin mix or drowning it in a heavy, badly drained one. It wants the rich-but-free-draining middle, plus a flowering (higher-potassium) feed in season.
pH — does it matter for hosta 'sum and substance'?
Most flowering plants, including hosta 'sum and substance', do well around pH 6.0-7.0. A cheap soil test is worth it outdoors; one notable exception is any acid-lover (such as some hydrangeas), where pH directly changes flower colour.
If you want to check or adjust it, the soil pH guide walks through testing and the safe ways to nudge a mix more acidic or more alkaline.
DIY mix vs a bagged one
A quality bagged compost works for hosta 'sum and substance' in pots if you add grit and a flowering feed. In beds, improving the existing soil with compost and ensuring drainage beats any bag.
Drainage and the pot
Free drainage protects the roots and especially the crown over winter — raised beds, grit in the planting hole and never a waterlogged spot. Containers must have a clear drainage hole.
For perennials, refresh the top layer and feed each spring rather than disturbing the roots; for container displays, start with fresh rich mix each season. When the time comes, our repotting guide for hosta 'sum and substance' covers the timing and technique step by step.
Hosta 'Sum and Substance' soil — frequently asked questions
What is the best soil mix for hosta 'sum and substance'?
3 parts good loam or quality peat-free compost : 1 part well-rotted compost or leaf mould : 1 part grit or perlite. Flowering is expensive for hosta 'sum and substance': producing buds, blooms and seed draws heavily on nutrients and steady moisture, so the soil has to keep delivering all season.
Can I use normal potting soil for hosta 'sum and substance'?
A thin, hungry or sandy mix gives hosta 'sum and substance' weak growth and few, short-lived flowers — it simply runs out of fuel. A quality bagged compost works for hosta 'sum and substance' in pots if you add grit and a flowering feed. In beds, improving the existing soil with compost and ensuring drainage beats any bag.
Does hosta 'sum and substance' need a special pH?
Most flowering plants, including hosta 'sum and substance', do well around pH 6.0-7.0. A cheap soil test is worth it outdoors; one notable exception is any acid-lover (such as some hydrangeas), where pH directly changes flower colour.
Should I buy a bagged mix or make my own for hosta 'sum and substance'?
A quality bagged compost works for hosta 'sum and substance' in pots if you add grit and a flowering feed. In beds, improving the existing soil with compost and ensuring drainage beats any bag.
How often should I refresh the soil for hosta 'sum and substance'?
For perennials, refresh the top layer and feed each spring rather than disturbing the roots; for container displays, start with fresh rich mix each season. Free drainage protects the roots and especially the crown over winter — raised beds, grit in the planting hole and never a waterlogged spot. Containers must have a clear drainage hole.
Keep reading
- Hosta 'Sum and Substance' care — the full brief (light, water, humidity, problems, pet safety)
- How often to water hosta 'sum and substance' — the schedule the mix feeds into
- Repotting hosta 'sum and substance' — when and how to refresh the mix
- Soil pH guide — test it and adjust it safely
- Should I water my plant? The simple check first
- Why is my plant wilting? Wet vs dry diagnosis
- Root rot — how the wrong soil starts it, and how to save the plant
- Best soil for rolling houseleek
- Best soil for spanish stonecrop
- Best soil for tuberous cranesbill
- All 11687 soil and potting-mix guides in the Growli library