How to Grow Hostas USA

Growth Stages

Stage	BBCH	Notes
Planting	0	RHS: plant in spring or autumn (avoid midsummer), spaced up to 90cm apart depending on mature size, at the same depth as the container; moist, fertile soil improved with compost or well-rotted manure.
Spring shoot emergence	0	UVM: tightly furled spring shoots emerge and can be cut near the soil for eating, often compared to asparagus. RHS: plants remain dormant until mid-spring, and emerging foliage can need fleece protection from late frosts.
Foliage growth and feeding	3	RHS: apply an annual mulch of compost or manure in borders, or Growmore on poorer soils in early spring; container plants need monthly liquid feeding through the growing season.
Late-summer flowering and autumn tidy	6	UVM: flowers appear in late summer on scapes with trumpet-shaped blooms, lettuce-flavoured and edible as a garnish. RHS: cut back dying foliage and flower stalks in late autumn for tidiness; divide large clumps in autumn or early spring, keeping 1-3 buds per division.

Quick Facts

Factor	Value
Drainage	Moist, fertile, including heavy clay improved with organic matter (RHS); UVM: well-drained.
Lifecycle	Herbaceous, clump-forming perennial. RHS: fully hardy, dormant until mid-spring, though emerging foliage can need frost protection with fleece.
Edible parts	shoots, leaves, flowers

At a Glance

Harvest & Storage

When to pick: UVM: cut young spring shoots near the soil while still tightly furled, before leaves unfurl -- flavour and texture are often compared to asparagus. Mature unfurled leaves can also be harvested but turn tougher and more bitter with age.

Storage

Wash and dry like any harvested vegetable, then use fresh in salads or fried with butter and garlic (UVM).

Pests

Vine weevil

low

Otiorhynchus sulcatus

Named by RHS specifically as a risk for container-grown plants; UVM does not mention it.

Snails

high

Gastropoda (snails, various spp.)

Named alongside slugs by RHS as stripping foliage.

Slugs

high

Gastropoda (slugs, various spp.)

Named independently by both RHS and UVM as the chief pest -- UVM notes slugs are most active in moist conditions above 50°F/50°F (10°C); RHS notes thicker-leaved cultivars like 'Devon Green' resist damage better.

Sources

1. University of Vermont Extension - Hosta: Not Just Another Pretty Plant

   Hardiness: USDA zones 3-8. Light: part to full shade, tolerates sun in northern states. Soil: well-drained, adequate space for mature growth. Harvest: spring shoots cut near the soil when new leaves emerge, tender and often compared to asparagus; mature unfurled leaves harvested later but become tougher and more bitter; flowers bloom late summer on scapes with trumpet-shaped blooms, flavour similar to lettuce, used as edible garnish. Culinary use: spring shoots added to salads or fried with butter and garlic; mature leaves substitute for spinach in soups/stews. Toxicity: hostas are toxic to dogs and cats; plants intended for eating must not have been treated with pesticides or other chemicals. Pests: slugs cause large irregular holes in foliage, most active above 50°F in moist conditions; organic deterrents recommended.

These source is specific to this region. The full list of 2 sources behind this guide (Royal Horticultural Society, University of Vermont Extension) is in the references of our UK guide to hostas; they describe the plant itself, which is the same wherever it grows.