Only you can determine that.
Any newly installed transplant needs adequate moisture in the rootball until the roots can extend into the surrounding soil.
If it's particularly hot, perhaps you need to rig shade a foot or so above the plant to help it through this establishment period.

Please probe the root ball -- is it soggy, moist, or dry?

Keep in mind that sometimes the soil surrounding a newly planted specimen may be saturated but the root ball of that plant will be dry. When watering be sure to get that plants root ball wet as well as the surrounding soil.

Look closely at the soil this plant is in to see how wet, or dry, it is.

kimmq is kimmsr

I recently transplanted from pot to garden over a week ago

==>>> you are way late in planting.. in z8 ... and not expect sever transplant shock ...

insert finger.. or use a spoon to gently FIND OUT how damp or dry the soil is ...

your base problem is you are guessing.. and then asking us to guess.. just find out ...

keep in mind.. just because you buy something .. that does not mean its the best time to plant it ...

by mid fall ... there will be a number of posts of us mocking each other.. as to who has the most summer collected pots ... waiting for fall planting ...

ken

I checked the level of moisture and sure enough the root ball was dry while the surrounding soil was damp. I've grown lavender for several years (just not in the garden) and I still worry and nitpick over how much or how little to give the little buggers. I know it's very late to be transplanting, but I took the risk anyway, so here's hoping for the best. I think I will use that great idea of partial shade until the plant is well adjusted; decided this morning to give it a slow, deep water that penetrated the rootball, and it's looking decidedly better. Thank you all for responding and the great advice!

There once was a school of thought that you could only plant at certain times of the year. Most horticulturists today think potted plants can be planted anytime the soil can be worked, ie. there is no "certain" time to plant, unless the plant is to produce food.

kimmq is kimmsr