Planting dill in Texas

My parents live in the Houston area, and have no luck at all growing dill. I live in Minnesota, and it grows like a weed here, reseeding every year. I just harvested a bunch of dill seed, and want to send a few ounces to my Mom to see if maybe the problem is getting fresh seeds.
I assume she should plant it now, and it'll come up on its own around November? Or should she wait until fall to plant it? Or maybe early next spring (like in February)?
I guess she could plant half now, and save the rest; if the first planting comes up, she'll have good dillseed to cook with. If it doesn't come up she gets a second chance.
What say y'all? (I can say "y'all" and get away with it cuz I still have an East Texas accent.) Thanks.
Bob
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We'all think she ought to plant it when she plants cool season crops like brocolli and such. It may just be too hot in Houston. Steve

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<http://www.google.com/search?client=safari&rls=en&q=creating+cool+microc limates&ie=UTF-8&oe=UTF-8>
Sadly I need sun and will have to reduce shade.
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Bill S. Jersey USA zone 5 shade garden
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