Cold hardiness & minimum temperature

Is Buddleja 'Lo and Behold Blue Chip' (Buddleja davidii 'Tobudchip' (Blue Chip))cold hardy? Hardiness zone & min temp

Also called Blue Chip butterfly bush, Lo & Behold Blue Chip.

More about buddleja 'lo and behold blue chip'

About Buddleja 'Lo and Behold Blue Chip'

Buddleja davidii 'Tobudchip' (Blue Chip) · also called Blue Chip butterfly bush, Lo & Behold Blue Chip · flowering

'Lo and Behold Blue Chip' is a dwarf, mounding butterfly bush smothered in blue-purple flowers from summer to frost. Bred to be near-sterile and non-invasive, it suits containers and small gardens and rebllooms without deadheading. Give it full sun and free-draining soil, and tidy it with a hard spring cut for the tidiest, most floriferous habit.

Cold limit: USDA 5-9 · RHS H6 (-23 to 32°C)

Watch for — Crown rot in wet or winter-wet soil: Dwarf buddlejas are prone to crown rot in heavy, soggy ground, especially over winter. Plant in sharply drained soil or a free-draining pot.

What buddleja 'lo and behold blue chip''s hardiness rating actually means

Yes — buddleja 'lo and behold blue chip' is genuinely cold hardy. Rated RHS H6 and USDA 5-9, it lives outdoors all year and needs winter cold rather than protection from it. Its RHS rating of H6 means: Hardy throughout the UK and northern Europe. On the US scale that maps to USDA 5-9 — the zones where it can be left outdoors year-round.

New to these scales? The USDA hardiness zone map explained covers how the zone numbers work, and you can find your own zone with the zone finder.

Minimum temperature — and what happens below it

Minimum survivable temperature is roughly about −20 to −15 °C. Buddleja 'Lo and Behold Blue Chip' is built for winter — once established it takes hard frost and snow in its stride.

Concretely, for buddleja 'lo and behold blue chip' as it gets too cold:

It tolerates winter lows to about −20 to −15 °C once established.
Below its rated zone, the visible damage is browned or blackened top growth and, in the worst case, a killed crown or root.
First-year, newly planted, or container-grown specimens are noticeably less hardy than established garden plants — the roots are exposed.

Can buddleja 'lo and behold blue chip' go outside or overwinter — and where?

Plant it out within USDA 5-9 and it overwinters with little or no help.
It does not want to come indoors — a warm winter room actually weakens a hardy plant by denying it dormancy.
The real risks in its range are waterlogging, wind-rock on young plants, and a late hard frost on new growth — not ordinary winter cold.

Work back from your local frost dates with the frost-date calculator: the last spring frost and first autumn frost are what really decide when buddleja 'lo and behold blue chip' can be outside. US growers can check USDA zones; UK growers should use the RHS hardiness ratings, which match the H6 figure above.

Buddleja 'Lo and Behold Blue Chip' hardiness — frequently asked questions

Is buddleja 'lo and behold blue chip' cold hardy?

Yes — buddleja 'lo and behold blue chip' is genuinely cold hardy. Rated RHS H6 and USDA 5-9, it lives outdoors all year and needs winter cold rather than protection from it. An outdoor plant. Buddleja 'Lo and Behold Blue Chip' is hardy across USDA 5-9; it belongs in the ground or a frost-proof container, not on a windowsill, and many types actively need a cold winter to perform.

What is the minimum temperature buddleja 'lo and behold blue chip' can survive?

Minimum survivable temperature is roughly about −20 to −15 °C. Buddleja 'Lo and Behold Blue Chip' is built for winter — once established it takes hard frost and snow in its stride.

What hardiness zone is buddleja 'lo and behold blue chip'?

Buddleja 'Lo and Behold Blue Chip' is rated USDA 5-9 and RHS H6 — Hardy throughout the UK and northern Europe.

Can buddleja 'lo and behold blue chip' survive winter outside?

Plant it out within USDA 5-9 and it overwinters with little or no help. It does not want to come indoors — a warm winter room actually weakens a hardy plant by denying it dormancy. The real risks in its range are waterlogging, wind-rock on young plants, and a late hard frost on new growth — not ordinary winter cold.

What happens to buddleja 'lo and behold blue chip' below its minimum temperature?

It tolerates winter lows to about −20 to −15 °C once established. Below its rated zone, the visible damage is browned or blackened top growth and, in the worst case, a killed crown or root. First-year, newly planted, or container-grown specimens are noticeably less hardy than established garden plants — the roots are exposed.