I'm trying my hand at growing sweet peas indoors for the first time. They're currently about 4 to 5 inches tall, and I've been pinching the top leaves to encourage bushier growth. I have them under full spectrum grow lights for 12 hours a day. The temperature in my spare room is a struggle, as it only gets up to around 15°C because I can't afford to heat it. I live on the east coast of Scotland and I've heard different advice about transplanting sweet peas outside—some say it's okay to move them out now while others recommend waiting until after the last frost in late April. What do you all think?
1 Answer
I planted mine outside as soon as they sprouted some leaves, around February. Now they’re thriving in their final pots. The idea is to get them used to the outdoors early, even if it’s a bit frosty at night. They actually get hardier this way. Just make sure they’re in a sheltered spot and can handle a bit of cold!

Wow! What area are you in? What's the temp been like?