For instance, she has used Deputy Foreign Minister Majallie Whbee to sign up blocs of Livni voters in the Arab and Druse sectors.

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"It is something I have thought about a lot, " says Mr. Fidelo, who designed Ms. Williams's garden and connected it to his own, which in turn connects to the yard of a third neighbor, Ken Druse, 62, a garden writer and photographer.

WSJ: Shared Backyards: Advice for Homeowners on Removing Fences to Create Bigger Gardens, More Space