Can I grow either of these in a greenhouse?
I've read some stuff that says to grow them outside only, but what would happen if I plant some in the greenhouse border?

no probs with either of them in the green house

__________________

We've grown gardeners delight in the g/h, they are prolific and continue on until 1st frost - they don't half sprawl though!

__________________
Manda.

Yet Nature is made better by no mean
But Nature makes that mean; so over that art
Which you say adds to Nature, is an art
That Nature makes.

What do you mean by "Sprawl"

You can grow them both in the greenhouse Oleander, but they'll both do just as well outside.

__________________

From each according to his ability, to each according to his needs.

You may want to tie your gardeners delight into some canes is what is meant by sprawling! It likes to make itself comfy!!!

Both can be grown in the greenhouse and will give earlier crops that way. Remember they are two very different types of tomato. Gardeners Delight is a small fruited tomato, suitable for salads or eating straight off the plant, Marmande is a cooking tomato - not pretty to look at but very tasty. Both are cordon types and appreciate tying to a cane or wire support, plus removing the sideshoots.