The non-lobed, flowering vine covering your trees is adult English ivy. Juvenile ivy has classic three-lobed leaves; after years, it transitions to unlobed leaves, produces spiky flowers, then blue-black berries that birds spread.

Overwintering English Ivy (Hedera) for Spring Displays
Hedera Ivy Decline Under Fluorescent Light: Light and Watering Fixes
English Ivy (Hedera helix): Versatile, Air-Purifying Climber and Trailer
English Ivy: Growing, Controlling, and Safely Enjoying This Classic Vine
English Ivy on Pines: Patience After Cutting Vines
Rooting English Ivy Cuttings to Cover Stumps
English Ivy Dieback: Fungal/Bacterial Leaf Spot from Excess Moisture
Poison Ivy Galls: Identification and Safe Removal
Eradicating English Ivy with a Scheduled Glyphosate Program
English Ivy vs. Irish Ivy: How to Tell Them Apart
Diagnosing and Treating English Ivy Decline Caused by Excess Moisture
Removing Ivy from Brick Walls Without Damaging Masonry
English Ivy Control: From Manual Removal to Chemical Strategies
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