I’ve never had luck transplanting nasturtiums. They are cooler weather,related to radishes so I’ve planted direct sown at about the same time as I plant cooler weather stuff.’marigolds are so easy,just toss the seeds where you want them when you plant tomatoes.
I’ve not ever grown petunias from seed. They like temperatures similar to tomatoes,hot weather but not as hot as summer in Arizona. My mom actually grows petunias in the winter in Phoenix but most places it’s a summer flower.
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