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Lobelia x speciosa Fan Series (Lobelia 'Fan')
Other names: Lobelia 'Fan' Mix
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Fan Series are herbaceous perennials, although tender in some parts, is also grown as an annual with dark-green, oblong leaves and in summer and autumn, bears spikes of densly-packed, flowers in shades of red, rose-pink, purple and crimson.
Plant in full sun or partial shade in fertile, moist soil
Suggested uses
Containers/Patio, Beds and borders, Cottage/Informal
UK hardiness
H5
USDA zones
Zone 7, Zone 8, Zone 9, Zone 10
Sunset zone
2, 3, 4, 5, 6, 7, 8, 9, 14, 15, 16, 17
WUCOLS
North-Central Coastal = Unknown Central Valley = Unknown South Coastal = Unknown South Inland = Unknown High and Intermediate Desert = Unknown Low Desert = Unknown
All three of these you've listed are in the Shoot database with lots of care information.
All are perennial (but two are described as 'often grown as an annual' which suggests they will need some frost protection and may be difficult to grow to flowering stage in the garden. But establishing well in good soil, ensuring they don't dry out over the next 8 weeks or so will help.
The Leucanthemum is the most likely to survive, but will do better if it gets settled before the autums. So again, water it well before planting, water the planting hole before planting and keep watered if it i needs it over the next few weeks.
But if you get them all on your plants list the amazing database will do the rest for you.