When a wedding runs over, the fix is usually the guest list, not the flowers. Because per-guest costs compound across several categories, trimming even ten guests can save more than cutting an entire smaller line item. If you're over budget, look there first, then at the venue and catering, which is where the real money sits.
Two habits prevent most budget blowups. First, hold back 5–10% as a contingency — weddings reliably generate small overages like vendor overtime, extra alterations and day-of tips. Second, track actual spending against your allocations as you book, rather than hoping it balances at the end. A budget you revisit is a budget that holds; one you set and forget rarely does.